I'm running Centos 4 with a fetchmail invoked by cron.

The fetchmail is in multidrop mode and is also piping to spamassassin. All works flawlessly apart from where we receive spam that is to a non existant user. Here spamassassin marks it as spam and it gets delivered to a spam account as I want it to, however the big problem is that an error message ("user not known" type) gets delivered to the mail administrator. Currently we are getting about 3000 of these per day.

All I want to do is suppress the "user not known" message. I do not want to change anything else. Is there a way of doing this?

I do not want to send all error messages to dev null, because then I could miss something important.

Here's hoping