Currently there are no Ansible roles that deal with deployment and configuration of a mail server. It is necessary to implement a couple of Ansible roles that would serve this purpose.

Two distinct roles are necessary, one for setting-up an SMTP server on localhost that then relays all mails to another server (and also serves the local accounts), and one that would set-up full IMAP/SMTP stack for receiving and sending the mails. These roles will be referred to as mail server and mail forwarder.

The mail forwarder role should be implemented as follows:
* Deploy Postfix on local server.
* Configure Postfix to accept mails destined for local server, and add support for it to use a different server as a relay for any other mail.
* Ability to define aliases for local accounts, so they would get forwarded to some external mail (for example mails destined for root@localhost).

The mail server role should be implemented as follows:
* Postfix for SMTP.
** Use LDAP for looking-up managed domains.
** Use LDAP for authenticating users.
** Require TLS for client authentication.
** Set-up grey-listing.
** Allow specification of trusted IPs/networks.
** Employ some form of virus checks.
** Employ some form of spam checks.
* Dovecot for IMAP.
** Use LDAP for looking-up managed users
** Authenticate users against LDAP.
** Do not allow unencrypted logins.
** Configure Sieve.
* Use the backports repository for getting the most up-to-date packages.
* Base the configuration and installation of packages on tutorial found on workaround.org.