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+#!/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 Arch 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 Artix 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 $domain as well, but they're free with Let's Encypt so you should have
+# them anyway.
+
+# 3. If you've been toying around with your server settings trying to get
+# postfix/dovecot/etc. working before running this, I recommend you `pacman -Rn`
+# everything first because this script is build on top of only the defaults.
+# Clear out /etc/postfix and /etc/dovecot yourself if needbe.
+
+echo 'Installing programs...'
+pacman -Syu --needed postfix dovecot opendkim spamassassin pigeonhole
+# Put your domain.tld here (not your subdomain)
+domain='domain.tld'
+subdom=${MAIL_SUBDOM:-mail}
+maildomain="$subdom.$domain"
+certdir="/etc/letsencrypt/live/$maildomain"
+
+[ ! -d "$certdir" ] && certdir="$(dirname "$(certbot certificates 2>/dev/null | grep "$maildomain\|*.$domain" -A 2 | awk '/Certificate Path/ {print $3}' | head -n1)")"
+
+[ ! -d "$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 $maildomain site in nginx or Apache for that to work." && exit 1
+
+# NOTE ON POSTCONF COMMANDS
+
+# The `postconf` command literally just adds the line in question to
+# /etc/postfix/main.cf so if you need to debug something, go there. It replaces
+# any other line that sets the same setting, otherwise it is appended to the
+# end of the file.
+
+echo "Configuring Postfix's main.cf..."
+
+# Necessary to later start Postfix
+postalias /etc/postfix/aliases
+
+# Change the cert/key files to the default locations of the Let's Encrypt cert/key
+postconf -e "smtpd_tls_key_file=$certdir/privkey.pem"
+postconf -e "smtpd_tls_cert_file=$certdir/fullchain.pem"
+postconf -e "smtp_tls_CAfile=$certdir/cert.pem"
+
+# Enable, but do not require TLS. Requiring it with other server would cause
+# mail delivery problems and requiring it locally would cause many other
+# issues.
+postconf -e 'smtpd_tls_security_level = may'
+postconf -e 'smtp_tls_security_level = may'
+
+# TLS required for authentication.
+postconf -e 'smtpd_tls_auth_only = yes'
+
+# Exclude obsolete, insecure and obsolete encryption protocols.
+postconf -e 'smtpd_tls_mandatory_protocols = >=TLSv1.2, <=TLSv1.3'
+postconf -e 'smtp_tls_mandatory_protocols = >=TLSv1.2, <=TLSv1.3'
+postconf -e 'smtpd_tls_protocols = >=TLSv1.2, <=TLSv1.3'
+postconf -e 'smtp_tls_protocols = >=TLSv1.2, <=TLSv1.3'
+
+# Exclude suboptimal ciphers.
+postconf -e 'tls_preempt_cipherlist = yes'
+postconf -e 'smtpd_tls_ciphers = high'
+postconf -e 'smtpd_tls_exclude_ciphers = aNULL, eNULL, EXPORT, LOW, EXP, MEDIUM, ADH, AECDH, DSS, ECDSA, CAMELLIA128, 3DES, CAMELLIA256, RSA+AES, DES, RC4, MD5, PSK, aECDH, EDH-DSS-DES-CBC3-SHA, EDH-RSA-DES-CBC3-SHA, KRB5-DES, CBC3-SHA'
+
+# 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'
+
+# Sender and recipient restrictions
+postconf -e 'smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination'
+
+# Prevent IP address leaks (also removes ip from incoming email)
+postconf -e 'header_checks = regexp:/etc/postfix/header_checks'
+
+echo '/^Received: .*/       IGNORE
+/^User-Agent: .*/     IGNORE
+/^X-Originating-IP:/  IGNORE' >> /etc/postfix/header_checks
+
+# 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/'
+
+# 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       -       n       -       -       smtpd
+  -o content_filter=spamassassin
+submission inet n       -       n       -       -       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       -       n       -       -       smtpd
+  -o syslog_name=postfix/smtps
+  -o smtpd_tls_wrappermode=yes
+  -o smtpd_sasl_auth_enable=yes
+spamassassin unix -     n       n       -       -       pipe
+  flags=R user=spamd argv=/usr/bin/vendor_perl/spamc -e /usr/bin/sendmail -oi -f ${sender} ${recipient}' >> /etc/postfix/master.cf
+
+
+# By default, Dovecot has a bunch of example configs in `/usr/share/doc/dovecot/example-config/` These
+# files have nice documentation if you want to read it, but it's a huge pain to go through them to organize.
+# Instead, we simply use /etc/dovecot/dovecot.conf because it's easier to manage.
+
+echo 'Generating a DH parameters file for Dovecot...'
+
+mkdir -p /etc/dovecot
+openssl dhparam -out /etc/dovecot/dh.pem 4096
+
+echo 'Creating Dovecot config...'
+
+echo "# Note that in the Dovecot conf, you can use:
+# %u for username
+# %n for the name in name@domain.tld
+# %d for the domain
+# %h the user's home directory
+
+# If you're not a brainlet, SSL must be set to required.
+ssl = required
+ssl_cert = <$certdir/fullchain.pem
+ssl_key = <$certdir/privkey.pem
+ssl_min_protocol = TLSv1.2
+ssl_cipher_list=ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!LOW:!MEDIUM:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
+ssl_prefer_server_ciphers = yes
+ssl_dh = </etc/dovecot/dh.pem
+# Plaintext login. This is safe and easy thanks to SSL.
+auth_mechanisms = plain login
+auth_username_format = %n
+
+protocols = \$protocols imap
+
+# Search for valid users in /etc/passwd
+userdb {
+	driver = passwd
+}
+
+#Fallback: Use plain old PAM to find user passwords
+passdb {
+	driver = pam
+}
+
+# Our mail for each user will be in ~/Mail, and the inbox will be ~/Mail/Inbox
+# The LAYOUT option is also important because otherwise, the boxes will be \`.Sent\` instead of \`Sent\`.
+mail_location = maildir:~/Mail:INBOX=~/Mail/Inbox:LAYOUT=fs
+namespace inbox {
+	inbox = yes
+	
+	mailbox Drafts {
+		special_use = \\Drafts
+		auto = subscribe
+	}
+
+	mailbox Junk {
+		special_use = \\Junk
+		auto = subscribe
+		autoexpunge = 30d
+	}
+
+	mailbox Sent {
+		special_use = \\Sent
+		auto = subscribe
+	}
+
+	mailbox Trash {
+		special_use = \\Trash
+	}
+
+	mailbox Archive {
+		special_use = \\Archive
+	}
+}
+
+# Here we let Postfix use Dovecot's authetication system.
+
+service auth {
+	unix_listener /var/spool/postfix/private/auth {
+		mode = 0660
+		user = postfix
+		group = postfix
+	}
+}
+
+protocol lda {
+	mail_plugins = \$mail_plugins sieve
+}
+
+protocol lmtp {
+	mail_plugins = \$mail_plugins sieve
+}
+
+plugin {
+	sieve = ~/.dovecot.sieve
+	sieve_default = /var/lib/dovecot/sieve/default.sieve
+	sieve_dir = ~/.sieve
+	sieve_global = /var/lib/dovecot/sieve/
+}
+" > /etc/dovecot/dovecot.conf
+
+mkdir -p /var/lib/dovecot/
+mkdir -p /var/lib/dovecot/sieve/
+
+echo "require [\"fileinto\", \"mailbox\"];
+if header :contains \"X-Spam-Flag\" \"YES\"
+	{
+		fileinto \"Junk\";
+	}" > /var/lib/dovecot/sieve/default.sieve
+
+grep -q '^vmail:' /etc/passwd || useradd vmail
+chown -R vmail:vmail /var/lib/dovecot
+sievec /var/lib/dovecot/sieve/default.sieve
+
+echo 'Preparing user authentication...'
+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 reject
+# as spam unfamiliar and unauthenticated email addresses. As in, the server
+# will flatly reject the email, not even delivering it to someone's Spam
+# folder.
+
+# OpenDKIM is a way to authenticate your email so you can send to such services
+# without a problem.
+
+# 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 "$subdom"
+
+# Generate the OpenDKIM info:
+echo 'Configuring OpenDKIM...'
+grep -q "$domain" /etc/postfix/dkim/keytable 2>/dev/null ||
+echo "$subdom._domainkey.$domain $domain:$subdom:/etc/postfix/dkim/$subdom.private" >> /etc/postfix/dkim/keytable
+
+grep -q "$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' >> /etc/postfix/dkim/trustedhosts
+
+# ...and source it from opendkim.conf
+cp /usr/share/doc/opendkim/opendkim.conf.sample /etc/opendkim/opendkim.conf
+sed -i "s/^Domain/Domain $domain/" /etc/opendkim/opendkim.conf
+sed -i 's/example.com//g' /etc/opendkim/opendkim.conf
+grep -q '^KeyTable' /etc/opendkim/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/opendkim.conf
+
+sed -i '/^#Canonicalization/s/simple/relaxed\/simple/' /etc/opendkim/opendkim.conf
+sed -i '/^#Canonicalization/s/^#//' /etc/opendkim/opendkim.conf
+
+sed -i '/Socket/s/^#*/#/' /etc/opendkim/opendkim.conf
+grep -q '^Socket\s*inet:12301@localhost' /etc/opendkim/opendkim.conf || echo 'Socket inet:12301@localhost' >> /etc/opendkim/opendkim.conf
+
+# 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 = $domain"
+postconf -e 'milter_default_action = accept'
+postconf -e 'milter_protocol = 6'
+postconf -e 'smtpd_milters = inet:localhost:12301'
+postconf -e 'non_smtpd_milters = inet:localhost:12301'
+postconf -e 'mailbox_command = /usr/lib/dovecot/deliver'
+
+for x in spamassassin opendkim dovecot postfix; do
+	printf "Restarting %s..." "$x"
+	systemctl enable restart "$x" && printf " ...done\\n"
+done
+
+pval="$(tr -d "\n" </etc/postfix/dkim/$subdom.txt | sed "s/k=rsa.* \"p=/k=rsa; p=/;s/\"\s*\"//;s/\"\s*).*//" | grep -o "p=.*")"
+dkimentry="$subdom._domainkey.$domain	TXT	v=DKIM1; k=rsa; $pval"
+dmarcentry="_dmarc.$domain	TXT	v=DMARC1; p=reject; rua=mailto:dmarc@$domain; fo=1"
+spfentry="$domain	TXT	v=spf1 mx a:$maildomain -all"
+
+useradd -m -G mail dmarc
+
+echo "$dkimentry
+$dmarcentry
+$spfentry" > "$HOME/dns_emailwizard"
+
+printf "\033[31m
+ _   _
+| \ | | _____      ___
+|  \| |/ _ \ \ /\ / (_)
+| |\  | (_) \ V  V / _
+|_| \_|\___/ \_/\_/ (_)\033[0m
+
+Add these three records to your DNS TXT records on either your registrar's site
+or your DNS server:
+\033[32m
+$dkimentry
+
+$dmarcentry
+
+$spfentry
+\033[0m
+NOTE: You may need to omit the \`.$domain\` portion at the beginning if
+inputting them in a registrar's web interface.
+
+Also, these are now saved to \033[34m~/dns_emailwizard\033[0m 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.
+"
+