On October 13, 2005, Scott Siddall and Ludovic Marcotte of Inverse groupe conseil presented a webinar on Open Source Email Solutions. Longsight has used a stack of open source software to handle our internal mail and clients' mail for the past several years. Using commodity hardware running Linux, with central identity integration, makes for a powerful and scalable combination.
A Flash presentation of the webinar is available at http://inverse.ca/webinar/oct_05/. Case studies of Denison University, Berklee School of Music, and HMC Montreal are included at the end of the presentation. Links to the stack of software described in the webinar are available below:
Postfix: SMTP server, alternative to Sendmail
Cyrus IMAP Server: mailstore, highly scalable
AMaVISd-new: interface between filters and SMTP server
SpamAssassin: rule-based spam filtering
ClamAV: antivirus filtering
Spamity: per-user filtering policies
Horde or SquirrelMail: webmail
IMAP Proxy: proxies connections between IMAP server and client; essential for webmail
Sympa: mailing list manager
MySQL or PostgreSQL: for preference storage
OpenLDAP: campus identity
Linux High-Availability - Heartbeat: fail-over for Linux servers
Linux Virtual Server: share load among servers
Munin: web-based monitoring
Nagios: service monitoring
