Hi, I whipped this up because I needed this functionality. I have no idea if it's suitable for general use. Here is what it does:
A new configuration value of 'relaydb' is added to /etc/imapd.conf as follows: relaydb: /etc/mail/access.db Then, whenever someone successfully logs into POP or IMAP, their IP address is added as a RELAY into the sendmail access db, using the db3 database routines. It's not the most elegant solution but it worked fine for me, so you may wish to include it in the main product (or not, in which case I'll keep the patch). The patch can be found at: http://secondwivescafe.com/cyrus-imap-POPB4SMTP-patch.txt Ron
