#!/bin/sh # THE SETUP # Mail will be stored in non-retarded Maildirs because it's $currentyear. This # makes it easier for use with isync, which is what I care about so I can have # an offline repo of mail. # The mailbox names are: Inbox, Sent, Drafts, Archive, Junk, Trash # Use the typical unix login system for mail users. Users will log into their # email with their passnames on the server. No usage of a redundant mySQL # database to do this. # DEPENDENCIES BEFORE RUNNING # 1. Have a Debian system with a static IP and all that. Pretty much any # default VPS offered by a company will have all the basic stuff you need. This # script might run on Ubuntu as well. Haven't tried it. If you have, tell me # what happens. # 2. Have a Let's Encrypt SSL certificate for $maildomain. You might need one # for $domain as well, but they're free with Let's Encypt so you should have # them anyway. # 3. If you've been toying around with your server settings trying to get # postfix/dovecot/etc. working before running this, I recommend you `apt purge` # everything first because this script is build on top of only the defaults. # Clear out /etc/postfix and /etc/dovecot yourself if needbe. # NOTE WHILE INSTALLING # On installation of Postfix, select "Internet Site" and put in TLD (without # `mail.` before it). echo "Installing programs..." apt install postfix dovecot-imapd dovecot-sieve opendkim spamassassin spamc # Check if OpenDKIM is installed and install it if not. which opendkim-genkey >/dev/null 2>&1 || apt install opendkim-tools domain="$(cat /etc/mailname)" subdom="mail" maildomain="$subdom.$domain" certdir="/etc/letsencrypt/live/$maildomain" [ ! -d "$certdir" ] && certdir="$(dirname "$(certbot certificates 2>/dev/null | grep "$maildomain" -A 2 | awk '/Certificate Path/ {print $3}')")" [ ! -d "$certdir" ] && echo "Note! You must first have a Let's Encrypt Certbot HTTPS/SSL Certificate for $maildomain. Use Let's Encrypt's Certbot to get that and then rerun this script. You may need to set up a dummy $maildomain site in nginx or Apache for that to work." && exit # NOTE ON POSTCONF COMMANDS # The `postconf` command literally just adds the line in question to # /etc/postfix/main.cf so if you need to debug something, go there. It replaces # any other line that sets the same setting, otherwise it is appended to the # end of the file. echo "Configuring Postfix's main.cf..." # Change the cert/key files to the default locations of the Let's Encrypt cert/key postconf -e "smtpd_tls_key_file=$certdir/privkey.pem" postconf -e "smtpd_tls_cert_file=$certdir/fullchain.pem" postconf -e "smtpd_use_tls = yes" postconf -e "smtpd_tls_auth_only = yes" postconf -e "smtp_tls_security_level = may" postconf -e "smtp_tls_loglevel = 1" # Here we tell Postfix to look to Dovecot for authenticating users/passwords. # Dovecot will be putting an authentication socket in /var/spool/postfix/private/auth postconf -e "smtpd_sasl_auth_enable = yes" postconf -e "smtpd_sasl_type = dovecot" postconf -e "smtpd_sasl_path = private/auth" #postconf -e "smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination" # NOTE: the trailing slash here, or for any directory name in the home_mailbox # command, is necessary as it distinguishes a maildir (which is the actual # directories that what we want) from a spoolfile (which is what old unix # boomers want and no one else). postconf -e "home_mailbox = Mail/Inbox/" # Research this one: #postconf -e "mailbox_command =" # master.cf echo "Configuring Postfix's master.cf..." sed -i "/^\s*-o/d;/^\s*submission/d;/^\s*smtp/d" /etc/postfix/master.cf echo "smtp unix - - n - - smtp smtp inet n - y - - smtpd -o content_filter=spamassassin submission inet n - y - - smtpd -o syslog_name=postfix/submission -o smtpd_tls_security_level=encrypt -o smtpd_sasl_auth_enable=yes -o smtpd_tls_auth_only=yes smtps inet n - y - - smtpd -o syslog_name=postfix/smtps -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes spamassassin unix - n n - - pipe user=debian-spamd argv=/usr/bin/spamc -f -e /usr/sbin/sendmail -oi -f \${sender} \${recipient}" >> /etc/postfix/master.cf # 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 overwrite # /etc/dovecot/dovecot.conf because it's easier to manage. You can get a backup # of the original in /usr/share/dovecot if you want. echo "Creating Dovecot config..." echo "# Dovecot config # 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 # If you're not a brainlet, SSL must be set to required. ssl = required ssl_cert = <$certdir/fullchain.pem ssl_key = <$certdir/privkey.pem ssl_dh = /etc/dovecot/dovecot.conf mkdir /var/lib/dovecot/sieve/ echo "require [\"fileinto\", \"mailbox\"]; if header :contains \"X-Spam-Flag\" \"YES\" { fileinto \"Junk\"; }" > /var/lib/dovecot/sieve/default.sieve cut -d: -f1 /etc/passwd | grep -q "^vmail" || useradd vmail chown -R vmail:vmail /var/lib/dovecot sievec /var/lib/dovecot/sieve/default.sieve echo "Preparing user authetication..." grep -q nullok /etc/pam.d/dovecot || echo "auth required pam_unix.so nullok account required pam_unix.so" >> /etc/pam.d/dovecot # OpenDKIM # A lot of the big name email services, like Google, will automatically # rejectmark as spam unfamiliar and unauthenticated email addresses. As in, the # server will flattly reject the email, not even deliverring it to someone's # Spam folder. # OpenDKIM is a way to authenticate your email so you can send to such services # without a problem. # TODO: add opendkim-tools ? # Create an OpenDKIM key in the proper place with proper permissions. echo "Generating OpenDKIM keys..." mkdir -p /etc/postfix/dkim opendkim-genkey -D /etc/postfix/dkim/ -d "$domain" -s "$subdom" chgrp opendkim /etc/postfix/dkim/* chmod g+r /etc/postfix/dkim/* # Generate the OpenDKIM info: echo "Configuring OpenDKIM..." grep -q "$domain" /etc/postfix/dkim/keytable 2>/dev/null || echo "$subdom._domainkey.$domain $domain:mail:/etc/postfix/dkim/mail.private" >> /etc/postfix/dkim/keytable grep -q "$domain" /etc/postfix/dkim/signingtable 2>/dev/null || echo "*@$domain $subdom._domainkey.$domain" >> /etc/postfix/dkim/signingtable grep -q "127.0.0.1" /etc/postfix/dkim/trustedhosts 2>/dev/null || echo "127.0.0.1 10.1.0.0/16 1.2.3.4/24" >> /etc/postfix/dkim/trustedhosts # ...and source it from opendkim.conf grep -q "^KeyTable" /etc/opendkim.conf 2>/dev/null || echo "KeyTable file:/etc/postfix/dkim/keytable SigningTable refile:/etc/postfix/dkim/signingtable InternalHosts refile:/etc/postfix/dkim/trustedhosts" >> /etc/opendkim.conf sed -i '/^#Canonicalization/s/simple/relaxed\/simple/' /etc/opendkim.conf sed -i '/^#Canonicalization/s/^#//' /etc/opendkim.conf sed -e '/Socket/s/^#*/#/' -i /etc/opendkim.conf grep -q "^Socket\s*inet:12301@localhost" /etc/opendkim.conf || echo "Socket inet:12301@localhost" >> /etc/opendkim.conf # OpenDKIM daemon settings, removing previously activated socket. sed -i "/^SOCKET/d" /etc/default/opendkim && echo "SOCKET=\"inet:12301@localhost\"" >> /etc/default/opendkim # Here we add to postconf the needed settings for working with OpenDKIM echo "Configuring Postfix with OpenDKIM settings..." postconf -e "smtpd_sasl_security_options = noanonymous, noplaintext" postconf -e "smtpd_sasl_tls_security_options = noanonymous" postconf -e "myhostname = $maildomain" postconf -e "milter_default_action = accept" postconf -e "milter_protocol = 6" postconf -e "smtpd_milters = inet:localhost:12301" postconf -e "non_smtpd_milters = inet:localhost:12301" postconf -e "mailbox_command = /usr/lib/dovecot/deliver" for x in dovecot postfix opendkim spamassassin; do printf "Restarting %s..." "$x" service "$x" restart && printf " ...done\\n" done pval="$(tr -d "\n" "$HOME/dns_emailwizard" echo " _ _ | \ | | _____ ___ | \| |/ _ \ \ /\ / (_) | |\ | (_) \ V V / _ |_| \_|\___/ \_/\_/ (_) Add these three records to your DNS TXT records on either your registrar's site or your DNS server: $dkimentry $dmarcentry $spfentry NOTE: You may need to omit the \`.$domain\` portion at the beginning if inputting them in a registrar's web interface. Also saving these to ~/dns_emailwizard in case you want them in a file. Once you do that, you're done! Check the README for how to add users/accounts and how to log in."