initial commit
This commit is contained in:
Chang, Chu-Kuan
commit
59307a11f5
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# Email server setup script
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I wrote this script during the gruelling process of installing and setting up
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an email server. It perfectly reproduces my successful steps to ensure the
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same setup time and time again.
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Read this readme and peruse the script's comments before running it. Expect it
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to fail and you have to do bug testing and you will be very happy when it
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actually works perfectly.
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## This script installs
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- **OpenSMTPD** to send and receive mail.
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- **Dovecot** to get mail to your email client (mutt, Thunderbird, etc).
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- Config files that unique the two above securely with native log-ins.
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- **Rspamd** to prevent spam and allow you to make custom filters.
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- **opensmtpd-filter-dkimsign** to validate you so you can send to Gmail and
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other big sites.
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## This script does _not_
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- use a SQL database or anything like that.
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- set up a graphical interface for mail like Roundcube or Squirrel Mail. If you
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want that, you'll have to install it yourself. I just use
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[isync/msmtp/mutt-wizard](https://github.com/lukesmithxyz/mutt-wizard) to
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have an offline mirror of my email setup and I recommend the same. There are
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other ways of doing it though, like Thunderbird, etc.
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## Requirements
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1. A **OpenBSD server**. I've tested this on a
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[Vultr](https://www.vultr.com/?ref=8608122) OpenBSD server and their setup
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works, but I suspect other VPS hosts will have similar/possibly identical
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default settings which will let you run this on them. Note that the affiliate
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link there to Vultr gives you a $100 credit for the first month to play
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around.
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2. **A Let's Encrypt SSL certificate for your site's `mx` subdomain**.
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Create a httpd(1) site at `mx.domain.tld` and get a certificate
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for it with acme-client(1).
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3. You need two little DNS records set on your domain registrar's site/DNS
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server: (1) an **MX record** pointing to your own main domain/IP and (2) a
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**CNAME record** for your `mail.` subdomain.
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4. **A Reverse DNS entry for your site.** Go to your VPS settings and add an
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entry for your IPV4 Reverse DNS that goes from your IP address to
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`mx.domain.tld`. If you would like IPV6, you can do the same for
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that. This has been tested on Vultr, and all decent VPS hosts will have
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a section on their instance settings page to add a reverse DNS PTR entry.
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You can use the 'Test Email Server' or ':smtp' tool on
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[mxtoolbox](https://mxtoolbox.com/SuperTool.aspx) to test if you set up
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a reverse DNS correctly. This step is not required for everyone, but some
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big email services like gmail will stop emails coming from mail servers
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with no/invalid rDNS lookups. This means your email will fail to even
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make it to the receipients spam folder; it will never make it to them.
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6. Some VPS providers block port 25 (used to send mail). You may need to
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request that this port be opened to send mail successfully. Although I have
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never had to do this on a Vultr VPS, others have had this issue so if you
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cannot send, contact your VPS provider.
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## Post-install requirement!
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- After the script runs, you'll have to add additional DNS TXT records which
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are displayed at the end when the script is complete. They will help ensure
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your mail is validated and secure.
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- Modify rspamd whitelists/blacklists in `/etc/rspamd/local.d` to yout need.
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## Making new users/mail accounts
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Let's say we want to add a user Billy and let him receive mail, run this:
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```
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useradd -m billy
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passwd billy
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```
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A user's mail will appear in `~/Maildir/`. If you want to see your mail while
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ssh'd in the server, you could just install mutt, add `set spoolfile="+Inbox"`
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to your `~/.muttrc` and use mutt to view and reply to mail. You'll probably want
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to log in remotely though:
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## Logging in from Thunderbird or mutt (and others) remotely
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Let's say you want to access your mail with Thunderbird or mutt or another
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email program. For my domain, the server information will be as follows:
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- SMTP server: `mx.domain.tld`
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- SMTP port: 465
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- IMAP server: `mx.domain.tld`
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- IMAP port: 993
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- Username `user` (I.e. *not* `user@domain.tld`)
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The last point is important. Many email systems use a full email address on
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login. Since we just simply use local PAM logins, only the user's name is used
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(this makes a difference if you're using luke's
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[mutt-wizard](https://github.com/lukesmithxyz/mutt-wizard), etc.).
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## Tweaking things
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You're a big boy now if you have your own mail server!
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You can tweak smtpd (sending mail
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## Furthur reading
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- [poolp's guide](https://poolp.org/posts/2019-09-14/setting-up-a-mail-server-with-opensmtpd-dovecot-and-rspamd/)
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## Troubleshooting -- Can't send mail?
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- Always check `/var/log/maillog` and `/var/log/rspamd` to see the specific
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problem.
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- Go to [this site](https://appmaildev.com/en/dkim) to test your TXT records.
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If your DKIM, SPF or DMARC tests fail you probably copied in the TXT records
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incorrectly.
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- If everything looks good and you *can* send mail, but it still goes to Gmail
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or another big provider's spam directory, your domain (especially if it's a
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new one) might be on a public spam list. Check
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[this site](https://mxtoolbox.com/blacklists.aspx) to see if it is. Don't
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worry if you are: sometimes especially new domains are automatically assumed
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to be spam temporaily. If you are blacklisted by one of these, look into it
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and it will explain why and how to remove yourself.
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@ -0,0 +1,475 @@
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#!/bin/sh
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# _ _ _
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# ___ _ __ ___ __ _(_) |_ _(_)____
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# / _ \ '_ ` _ \ / _` | | \ \ /\ / / |_ /
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#| __/ | | | | | (_| | | |\ V V /| |/ /
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# \___|_| |_| |_|\__,_|_|_| \_/\_/ |_/___|
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#
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#
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# THE SETUP
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#
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# Login info:
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# SMTPs server: mx.domain.tld (${subdom}.${domain})
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# SMTPs Setting: port 465, SSL/TLS, PLAIN
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# IMAPs server: mx.domain.tld (${subdom}.${domain})
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# IMAPs Setting: port 993, SSL/TLS, PLAIN
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# User: user name w/o '@domain.tld'
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# Firewall setting, open following port:
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# SMPT port 25
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# SMTPs port 465
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# IMAPs port 993
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# Mail will be stored in non-retarded Maildirs because it's ${current_year}. This
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# makes it easier for use with isync, which is what I care about so I can have
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# an offline repo of mail.
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# The mailbox names are: Inbox, Sent, Drafts, Archive, Spam, Trash
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# Use the typical unix login system for mail users. Users will log into their
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# email with their passnames on the server. No usage of a redundant mySQL
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# database to do this.
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# Rspamd whitelists and blacklists are in /etc/rspamd/.local.d. Modify them to
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# your own need.
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|
||||
#
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# DEPENDENCIES BEFORE RUNNING
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#
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# 1. Modify "Paramater" section to your need.
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||||
# 2. Have a OpenBSD 6.7 system with a static IP and all that. Pretty much any
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# default VPS offered by a company will have all the basic stuff you need.
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||||
# 3. Have a Let's Encrypt SSL certificate for mx.domain.tld
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# (${subdom}.${domain}) using httpd(1) and acme-client(1).
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# 4. If you've been toying around with your server settings trying to get
|
||||
# smtpd/dovecot/rspamd/etc. I recommend you to clear out /etc/mail, /etc/dovecot
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# , and /etc/rspamd/local.d yourself if needbe, because this script is build on
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# top of only the defaults.
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||||
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||||
#
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||||
# Parameters
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||||
#
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||||
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# Modify this section to your need
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readonly domain='domain.tld'
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readonly subdom='mx'
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# DO NOT modify this part
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readonly maildomain="${subdom}.${domain}"
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readonly progname="$(basename "$0")"
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# Certificate for smtp
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readonly certfile="/etc/ssl/${maildomain}.fullchain.pem"
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readonly keyfile="/etc/ssl/private/${maildomain}.key"
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# RSA key for dkim
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readonly dkimkey="/etc/mail/dkim/${domain}.key"
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||||
#
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# Check privilege
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#
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||||
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if test "$(id -u)" != '0'; then
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printf '%s: Root access required.\n' "${progname}"
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printf '%s: Exiting...\n' "${progname}"
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exit 1
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fi
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#
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# Check dependency
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#
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printf '%s: Installing programs...\n' "${progname}"
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pkg_add opensmtpd-filter-dkimsign dovecot dovecot-pigeonhole rspamd opensmtpd-filter-rspamd
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if test ! -f /etc/doas.conf; then
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printf '%s: doas(1) not configured.\n' "${progname}"
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printf '%s: Exiting...\n' "${progname}"
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exit 1
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fi
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#
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# Check certificate
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#
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printf '%s: Checking Certificate files...' "${progname}"
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if test -f "${certfile}" && test -f "${keyfile}"; then
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printf ' Done\n'
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else
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printf ' File not found\n'
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printf '%s: Note! You must first have a HTTPS/SSL Certificate for %s.
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Use acme-client(1) and httpd(1) to get that and then rerun this script.' "${progname}" "${maildomain}"
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printf '%s: Exiting...\n' "${progname}"
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exit 1
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fi
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|
||||
#
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# Configure alternative server name ( /etc/mail/mailname )
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#
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printf '%s: Configuring alternative server name (/etc/mail/mailname)...\n' "${progname}"
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test -f /etc/mail/mailname && cp -f /etc/mail/mailname /etc/mail/mailname.def
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printf '%s\n' "${maildomain}" > /etc/mail/mailname
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||||
#
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# Configure OpenSMTPD ( /etc/mail/smtpd.conf )
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#
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printf '%s: Configuring OpenSMTPD (smtpd.conf)...\n' "${progname}"
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||||
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cp -f /etc/mail/smtpd.conf /etc/mail/smtpd.conf.def
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cat << EOF > /etc/mail/smtpd.conf
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# Generated by emailwiz
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# This is the smtpd server system-wide configuration file.
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# See smtpd.conf(5) for more information.
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||||
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||||
pki "${maildomain}" cert "${certfile}"
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pki "${maildomain}" key "${keyfile}"
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|
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filter "check_rdns" phase connect match !rdns disconnect "550 no rDNS"
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filter "check_fcrdns" phase connect match !fcrdns disconnect "550 no FCrDNS"
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filter "rspamd" proc-exec "filter-rspamd"
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filter "spam_triad" chain { "check_rdns", "check_fcrdns", "rspamd" }
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filter "dkimsign" proc-exec "filter-dkimsign -d ${domain} -s ${subdom} -k ${dkimkey}" user _dkimsign group _dkimsign
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||||
|
||||
table aliases file:/etc/mail/aliases
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|
||||
listen on lo0
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listen on egress port 25 tls pki "${maildomain}" filter "spam_triad"
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listen on egress port 465 smtps pki "${maildomain}" auth filter "dkimsign"
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||||
action "local_mail" lmtp "/var/dovecot/lmtp" alias <aliases>
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action "outbound" relay helo "${maildomain}"
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||||
|
||||
match from local for local action "local_mail"
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match from local for any action "outbound"
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match from any for domain "${domain}" action "local_mail"
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match from any auth for any action "outbound"
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||||
|
||||
EOF
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||||
|
||||
#
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# Configure Dovecot ( /etc/dovecot/dovecot.conf )
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||||
#
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||||
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||||
# By default, dovecot has a bunch of configs in /etc/dovecot/conf.d/ These
|
||||
# files have nice documentation if you want to read it, but it's a huge pain to
|
||||
# go through them to organize. Instead, we simply rewrite dovecot.conf because
|
||||
# it's easier to manage.
|
||||
|
||||
printf '%s: Configuring Dovecot (dovecot.conf)...\n' "${progname}"
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||||
|
||||
cp -f /etc/dovecot/dovecot.conf /etc/dovecot/dovecot.conf.def
|
||||
cat << EOF > /etc/dovecot/dovecot.conf
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||||
# Generate by emailwiz
|
||||
|
||||
# Note that in the dovecot.conf, you can use:
|
||||
# %u for username
|
||||
# %n for the name in name@domain.tld
|
||||
# %d for the domain
|
||||
# %h the user's home directory
|
||||
|
||||
|
||||
# Use imap and lmtp ( deliver mail for OpenSMTPD )
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||||
protocols = imap lmtp
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||||
|
||||
# Our mail for each user will be in ~/Maildir, and the inbox will be ~/Maildir/Inbox
|
||||
# The LAYOUT option is also important because otherwise, the boxes will be ".Sent" instead of "Sent".
|
||||
mail_location = maildir:~/Maildir:INBOX=~/Maildir/Inbox:LAYOUT=fs
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||||
namespace inbox {
|
||||
|
||||
inbox = yes
|
||||
|
||||
mailbox Drafts {
|
||||
special_use = \\Drafts
|
||||
auto = subscribe
|
||||
}
|
||||
|
||||
mailbox Spam {
|
||||
special_use = \\Junk
|
||||
auto = subscribe
|
||||
autoexpunge = 30d
|
||||
}
|
||||
|
||||
mailbox Sent {
|
||||
special_use = \\Sent
|
||||
auto = subscribe
|
||||
}
|
||||
|
||||
mailbox Trash {
|
||||
special_use = \\Trash
|
||||
auto = subscribe
|
||||
}
|
||||
|
||||
mailbox Archive {
|
||||
special_use = \\Archive
|
||||
auto = subscribe
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
# Use BSDAuth to authenticate the user
|
||||
passdb {
|
||||
driver = bsdauth
|
||||
}
|
||||
# Retrieves post-login information in /etc/passwd
|
||||
userdb {
|
||||
driver = passwd
|
||||
}
|
||||
|
||||
# Outlook Express and Windows Mail works only with LOGIN mechanism, not the standard PLAIN:
|
||||
auth_mechanisms = plain login
|
||||
# Use plain user name instead of user@domain for login
|
||||
auth_username_format = %n
|
||||
|
||||
# Configure SSL/TLS
|
||||
# NOTE: If you have only plaintext mechanisms enabled
|
||||
# (e.g. auth { mechanisms = plain login } ), ssl=yes and ssl=required are
|
||||
# completely equivalent because in either case the authentication will fail
|
||||
# unless SSL/TLS is enabled first
|
||||
ssl = required
|
||||
ssl_cert = <${certfile}
|
||||
ssl_key = <${keyfile}
|
||||
|
||||
# Disable insecure IMAP
|
||||
service imap-login {
|
||||
inet_listener imap {
|
||||
#port = 143
|
||||
port = 0
|
||||
}
|
||||
inet_listener imaps {
|
||||
#port = 993
|
||||
#ssl = yes
|
||||
}
|
||||
}
|
||||
|
||||
# Configure LMTP
|
||||
service lmtp {
|
||||
unix_listener lmtp {
|
||||
mode = 0666
|
||||
}
|
||||
}
|
||||
|
||||
# Configure sieve
|
||||
protocol lmtp {
|
||||
mail_plugins = \$mail_plugins sieve
|
||||
}
|
||||
|
||||
plugin {
|
||||
# The location of the user's main script storage. The active script
|
||||
# in this storage is used as the main user script executed during
|
||||
# delivery. The include extension fetches the :personal scripts
|
||||
# from this location. When ManageSieve is used, this is also where
|
||||
# scripts are uploaded. This example uses the file system as
|
||||
# storage, with all the user's scripts located in the directory
|
||||
# "~/sieve" and the active script (symbolic link) located at
|
||||
# "~/.dovecot.sieve".
|
||||
sieve = file:~/sieve;active=~/.dovecot.sieve
|
||||
|
||||
# If the user has no personal active script (i.e. if the location
|
||||
# indicated in sieve= does not exist or has no active script), use
|
||||
# this one:
|
||||
sieve_default = /usr/local/lib/dovecot/sieve/default.sieve
|
||||
|
||||
# The include extension fetches the :global scripts from this
|
||||
# location.
|
||||
sieve_global = /usr/local/lib/dovecot/sieve/global/
|
||||
}
|
||||
|
||||
EOF
|
||||
|
||||
#
|
||||
# Generate sieve scripts for Dovecot ( /usr/local/lib/dovecot/sieve/* )
|
||||
#
|
||||
|
||||
printf '%s: Generating sieve scripts for Dovecot ( /usr/local/lib/dovecot/sieve/* )...\n' "${progname}"
|
||||
|
||||
mkdir -p /usr/local/lib/dovecot/sieve/
|
||||
|
||||
# Default sieve script: put Rspamd-tagged mails into mailbox "Spam"
|
||||
cat << EOF > /usr/local/lib/dovecot/sieve/default.sieve
|
||||
require "fileinto";
|
||||
if header :contains "X-Spam" "YES" {
|
||||
fileinto "Spam";
|
||||
}
|
||||
|
||||
EOF
|
||||
|
||||
# Compile sieve scripts
|
||||
sievec /usr/local/lib/dovecot/sieve/default.sieve
|
||||
|
||||
#
|
||||
# Configure user authentication for Dovecot ( /etc/login.conf )
|
||||
#
|
||||
|
||||
printf '%s: Configuring user authentication for Dovecot (/etc/login.conf)...\n' "${progname}"
|
||||
|
||||
if ! grep -q 'dovecot' /etc/login.conf; then
|
||||
cp -f /etc/login.conf /etc/login.conf.def
|
||||
cat << EOF >> /etc/login.conf
|
||||
|
||||
#
|
||||
# Dovecot entry
|
||||
#
|
||||
dovecot:\\
|
||||
:openfiles-cur=1024:\\
|
||||
:openfiles-max=2048:\\
|
||||
:tc=daemon:
|
||||
|
||||
EOF
|
||||
|
||||
fi
|
||||
|
||||
# reload login.conf
|
||||
cap_mkdb /etc/login.conf
|
||||
|
||||
#
|
||||
# Configure rspamd ( /etc/rspamd/local.d/action.conf )
|
||||
#
|
||||
|
||||
printf '%s: Configuring Rspamd (action.conf)...\n' "${progname}"
|
||||
|
||||
mkdir -p /etc/rspamd/local.d/
|
||||
|
||||
cat << EOF > /etc/rspamd/local.d/action.conf
|
||||
# Generate by emailwiz
|
||||
|
||||
actions {
|
||||
#reject = 15; # Reject when reaching this score
|
||||
reject = null; # Disable Rejection
|
||||
add_header = 6; # Add header when reaching this score
|
||||
greylist = 4; # Apply greylisting when reaching this score (will emit "soft reject action")
|
||||
}
|
||||
|
||||
EOF
|
||||
|
||||
printf '%s: Configuring Rspamd black/whitelist (multimap.conf)...\n' "${progname}"
|
||||
|
||||
for x in 'local_bl_from.map.inc' 'local_bl_ip.map.inc' 'local_bl_rcpt.map.inc' \
|
||||
'local_wl_from.map.inc' 'local_wl_ip.map.inc' 'local_wl_rcpt.map.inc'; do
|
||||
touch "/etc/rspamd/local.d/${x}"
|
||||
chmod 666 "/etc/rspamd/local.d/${x}"
|
||||
done
|
||||
|
||||
cat << EOF > /etc/rspamd/local.d/multimap.conf
|
||||
# Blacklists
|
||||
|
||||
local_bl_ip {
|
||||
type = "ip";
|
||||
map = "\$LOCAL_CONFDIR/local.d/local_bl_ip.map.inc";
|
||||
symbol = "LOCAL_BL_IP";
|
||||
description = "Local ip blacklist";
|
||||
score = 5;
|
||||
}
|
||||
|
||||
local_bl_from {
|
||||
type = "from";
|
||||
map = "\$LOCAL_CONFDIR/local.d/local_bl_from.map.inc";
|
||||
symbol = "LOCAL_BL_FROM";
|
||||
description = "Local from blacklist";
|
||||
score = 5;
|
||||
}
|
||||
|
||||
local_bl_rcpt {
|
||||
type = "rcpt";
|
||||
map = "\$LOCAL_CONFDIR/local.d/local_bl_rcpt.map.inc";
|
||||
symbol = "LOCAL_BL_RCPT";
|
||||
description = "Local rcpt blacklist";
|
||||
score = 5;
|
||||
}
|
||||
|
||||
# Whitelists
|
||||
|
||||
local_wl_ip {
|
||||
type = "ip";
|
||||
map = "\$LOCAL_CONFDIR/local.d/local_wl_ip.map.inc";
|
||||
symbol = "LOCAL_WL_IP";
|
||||
description = "Local ip whitelist";
|
||||
score = -5;
|
||||
}
|
||||
|
||||
local_wl_from {
|
||||
type = "from";
|
||||
map = "\$LOCAL_CONFDIR/local.d/local_wl_from.map.inc";
|
||||
symbol = "LOCAL_WL_FROM";
|
||||
description = "Local from whitelist";
|
||||
score = -5;
|
||||
}
|
||||
|
||||
local_wl_rcpt {
|
||||
type = "rcpt";
|
||||
map = "\$LOCAL_CONFDIR/local.d/local_wl_rcpt.map.inc";
|
||||
symbol = "LOCAL_WL_RCPT";
|
||||
description = "Local rcpt whitelist";
|
||||
score = -5;
|
||||
}
|
||||
|
||||
EOF
|
||||
|
||||
#
|
||||
# Configure opensmtpd-filter-dkimsign
|
||||
#
|
||||
|
||||
printf '%s: Generating dkim keys...\n' "${progname}"
|
||||
mkdir -p /etc/mail/dkim
|
||||
doas -u _dkimsign openssl genrsa -out "${dkimkey}" 2048
|
||||
|
||||
#
|
||||
# Restart daemons
|
||||
#
|
||||
|
||||
for x in 'smtpd' 'dovecot' 'rspamd'; do
|
||||
printf '%s: Enabling %s...' "${progname}" "${x}"
|
||||
rcctl enable "${x}" 2>&1 > /dev/null && printf ' Done\n' || printf ' Failed\n'
|
||||
printf '%s: Restarting %s...' "${progname}" "${x}"
|
||||
rcctl restart "${x}" 2>&1 > /dev/null && printf ' Done\n' || printf ' Failed\n'
|
||||
done
|
||||
|
||||
#
|
||||
# Display DNS Record & Finish up
|
||||
#
|
||||
|
||||
readonly pval="$(openssl rsa -in "${dkimkey}" -pubout \
|
||||
| sed '1s/.*/p=/;:nl;${s/-----.*//;q;};N;s/\n//g;b nl;')"
|
||||
readonly dkim_entry="${subdom}._domainkey.${domain} TXT v=DKIM1; k=rsa; ${pval}"
|
||||
readonly dmarc_entry="_dmarc.${domain} TXT v=DMARC1; p=none; rua=mailto:postmaster@${domain}; fo=1"
|
||||
readonly spf_entry="@ TXT v=spf1 mx a:${maildomain} -all"
|
||||
|
||||
cat << EOF > "${HOME}/dns_emailwiz"
|
||||
${dkim_entry}
|
||||
${dmarc_entry}
|
||||
${spf_entry}
|
||||
|
||||
EOF
|
||||
|
||||
cat << EOF
|
||||
|
||||
_ _
|
||||
| \ | | _____ ___
|
||||
| \| |/ _ \ \ /\ / (_)
|
||||
| |\ | (_) \ V V / _
|
||||
|_| \_|\___/ \_/\_/ (_)
|
||||
|
||||
1. Add these three records to your DNS TXT records on either your registrar's site
|
||||
or your DNS server:
|
||||
|
||||
${dkim_entry}
|
||||
|
||||
${dmarc_entry}
|
||||
|
||||
${spf_entry}
|
||||
|
||||
NOTE: You may need to omit the ".${domain}" portion at the beginning if
|
||||
inputting them in a registrar's web interface.
|
||||
|
||||
Also saving these to ~/dns_emailwiz in case you want them in a file.
|
||||
|
||||
EOF
|
||||
|
|
@ -0,0 +1,22 @@
|
|||
#!/bin/sh
|
||||
# Program:
|
||||
# * restart mail server related daemons
|
||||
# Dependency:
|
||||
# * nil
|
||||
# History:
|
||||
# * 20200912 cckuan first release
|
||||
|
||||
readonly progname="$(basename "$0")"
|
||||
|
||||
if test "$(id -u)" != '0'; then
|
||||
printf '%s: Root access required.\n' "${progname}"
|
||||
printf '%s: Exiting...\n' "${progname}"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
for x in 'smtpd' 'dovecot' 'rspamd'; do
|
||||
printf '%s: Restarting %s...' "${progname}" "${x}"
|
||||
rcctl restart "${x}" 2>&1 > /dev/null \
|
||||
&& printf ' Done\n' \
|
||||
|| printf ' Failed\n'
|
||||
done
|
||||
Loading…
Reference in New Issue