This mail platform does use a fair amount of memory, the memory usage is ClamAV and Solr, the latter being used for IMAP SEARCH. I personally use 2 GB.

I’ll warn you all now, this is a long article.

SSL

sudo openssl genrsa -out /etc/ssl/private/mail.key 4096
sudo openssl req -new -key /etc/ssl/private/mail.key -out /tmp/mail.csr
sudo openssl x509 -req -days 365 -in /tmp/mail.csr -signkey /etc/ssl/private/mail.key -out /etc/ssl/certs/mail.crt

MySQL

sudo apt-get install mysql-server

You’ll be prompted several times for a password for MySQL during the installation, just come up with something nice and secure.

The first thing to set-up will be the MySQL database and schema.

mysql -u root -p

Next up, create the database.

CREATE DATABASE mailserver CHARACTER SET utf8 COLLATE utf8_general_ci;

And grant some privileges, you’ll need …

This guide is part 1 of what I plan will be a couple of guides that take you through installing a base mail system, SpamAssassin, DKIM and much more. Stay tuned.

This guide was written for Debian 6 but should be the same or similar for Debian 5 and Ubuntu 10.04 and above.

The installation

sudo apt-get install dovecot-imapd postfix sasl2-bin libsasl2-2 libsasl2-modules

Choose “Internet site” when prompted and enter the fully qualified name of your server.

Once all this is done installing we’ll need to make some changes, first off will be Postfix.

Postfix

Open up /etc/postfix/main.cf and add the following to the end of the file

home_mailbox = Maildir/
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
broken_sasl_auth_clients = yes

smtpd_sender_restrictions = permit_sasl_authenticated,
    permit_mynetworks,

smtpd_recipient_restrictions = permit_mynetworks,
    permit_sasl_authenticated,
    reject_unauth_destination,
    reject_unknown_sender_domain,

Here we basically tell Postfix to store all email in maildir format in the user’s home directory. We …