mysql logon update

[Ross Anderson]

I'm not certain if this is the right place to ask but here goes. We have 
a cyrus imap-sasld-mysql virtual domain setup. We're using mysql as the 
auth layer. At one point and time the mysql DB was updated with last 
logon however this no longer occurs. Can anyone give me any hints on 
where to look?

cyrus sasl 2.1.22
cyrus-imap-admin 2.2.12
cyrus-imapd 2.2.12
mysql-5.0.44


Thanks,