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Note: This document has been tested on Alpine Linux 2.2.2, but contains some packages which are currently in the [edge/testing repository].
Note: Use a computer with at least 512MB of RAM.

Steps

This guide will get a basic rt4 setup working that will allow inbound emails to create/update issues, and assumes that you have a working postfix setup already.

add edge/main and edge/testing repos to /etc/apk/repositories

printf "http://nl.alpinelinux.org/alpine/edge/main\nhttp://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
apk update

apk add lighttpd fcgi postgresql rt4 php php-cli php-common postfix postfix-pcre msmtp
Edit lighttpd.conf and enable fastcgi
/etc/init.d/lighttpd start
ln -s /usr/share/rt4/html /var/www/localhost/htdocs/rt4
/etc/init.d/postgresql setup
/etc/init.d/postgresql start
su - postgres -c "createuser -P"

Enter name of role to add: rt_user
Enter password for new role: rtpass
Enter it again: rtpass
Shall the new role be a superuser? (y/n) n
Shall the new role be allowed to create databases? (y/n) y
Shall the new role be allowed to create more new roles? (y/n) y

cp /etc/rt4/RT_Config.pm /etc/rt4/RT_SiteConfig.pm
chmod 644 /etc/rt4/RT_SiteConfig.pm
/etc/rt4/RT_SiteConfig.pm change to use Pg instead of mysql and change DatabasePassword to correspond to the password created for rt_user in postgresql.
/usr/sbin/rt-setup-database --action init
rt-server
Test and make sure that you can access rt using the built-in webserver first.
Tools -> Configuration -> Queues -> Create... Give it a name like 'support', which you'll use in the next sections (including the email address)
Add to /etc/postfix/main.cf:

virtual_alias_maps = regexp:/etc/postfix/rt4-aliases, transport_maps = regexp:/etc/postfix/rt4-transport

Create /etc/postfix/rt4-aliases (replacing example.com):

/^(.*)@example.com$/ $1

Create /etc/postfix/rt4-transport:

/^support.*$/ rt4-support:

Add to /etc/postfix/master.cf:

rt4-support unix - n n - - pipe flags=DORhu user=postgres argv=/usr/bin/rt-mailgate --queue support --action correspond --url http://ip.addr.of.interface/

Allow users to create tickets by email by checking all General Rights for group Everyone in Tools -> Configuration -> Global -> Group Rights
Setup outbound emails:
/etc/rt4/msmtp-wrapper.conf:

defaults
logfile /var/log/msmtp.log
account default
host ip.addr.of.interface
port 25
auto_from on

/etc/rt4/msmtp-wrapper (chmod'd 755):

#!/bin/sh
msmtp -t -C /etc/rt4/msmtp_wrapper.conf
logger -t rt-mailer -p syslog.info -- CALL msmtp -nt "$@" RETURNED $?

/etc/rt4/RT_SiteConfig.pm:

Set($MailCommand, "sendmailpipe");
Set($SendmailPath, "/etc/rt4/msmtp_wrapper");