[CentOS] What's up with the mailing list spam?

> While this isn't perfect, fewer than 1 spam per month has made it through
> to any of the lists we host in the last year (at least one of which I
> approved accidentally :-).

I think it should be noted that this is probably the first time I've
seen a spam on the centos list that I can remember.  And I've been
subscribed here off and on for a couple years...

The system you're using does sound like a solid one though.