I'm looking for a very simple, lightweight SMTP server to run on an Ubuntu 9.04 VPS.
The only functionality I need is to support the PHP mail command;
<?php mail('firstname.lastname@example.org', 'My Subject', 'My message'); ?>
That's all it needs to do. I do not need logging, POP3, IMAP or anything else for inbound mail - just simple plain text SMTP. The emails will not have file attachments.
Any suggestions gratefully received.