> From: Lars Nielsen <lars@???>
> I am trying to handle my mail-server as proffesional as possible. I
> have some filters to aviod spam but I can see that some mails in my
> queue are spam.
In the queue means that those mails were generated by your users
or injected using passwords stolen from your users - right?
Then why didn't you investigate which user is responsible
and disable that user?
> Are there some good and recent guides on how to aviod spam?
Boot spamming users. Else you are an accomplice in spamming.
Make a clause in your contract with users: if a user spams
or the user's password is leaked and used by a spammer
then the user has to pay you a fine.
How to catch spamming users automatically:
https://lists.exim.org/lurker/message/20120217.130336.0dcc044b.en.html
