ucspi-tcp-0.88-mysql3+rss.patch problems

[ntwaddel]

Ive had a hard time pinpointing this problem.  I have various customers complain everyonce in a while that they will try to send mail and they will get a 553 sorry, that domain isn't in my list of allowed rcpthosts error.  Ive tried to replicate it, but i cant.  Ive noticed sometimes the timestamp on their ip on the relay table is not getting updated.  Has anyone else experienced this?  Recommend how to fix it?