"The developers extended Citadel's SpamAssassin interface to
include a SPAM blocking and tagging system, definable for each
Citadel site. Citadel 7.50 scans messages for malware (via ClamAV)
even without SpamAssassin enabled. According to the developers,
Citadel 7.5 contains several hundred bug fixes, as well as general
performance improvements and user interface enhancements."