Tim Jackson is a regular on the exim-users mailing list and is the author of the Spam and Virus Scanning with Exim 4 HOWTO, on which topic he gave a talk at the 2004 UK Exim training course.

Tim is also the current maintainer of the Exim RPMS

Another pet project is Tim's Bogus Virus Warnings ruleset for SpamAssassin. This helps to stop the collateral junk created by badly-configured virus scanners which bombard faked senders with 'you sent us a virus!'-type messages.

There are various random tidbits of information about Exim on Tim Jackson's Exim Pages.