Spamcheck for outgoing mail

[wwweiss]

I have a mailserver with many mailboxes and different domains. Proxmox Mailgateway is sitting in front of this mailserver für incomming and outgoing mails.
Sometimes mailaccounts get hacked (or the user has an trojan) and then these accounts are sending out lots of spam mails.
Is it possible that Proxmox scans outgoing mails in the same way than incomming and then move spams also to quarantine instead of sending them out?
With this I try to avoid getting blacklisted. Of course I understand that several tests will not work (IP checks, DNSBL, ....)
Any help or tipps how to configure this would be highly appreciated and also your opinion if this is a bad idea.

 

[tom]

See https://forum.proxmox.com/threads/filtering-outgoing-mails.78/

 

[wwweiss]

Wow - your response time needs to be measured in milliseconds
I used this thread already and configured an outgoing rule. Just today I had a problem with one customer sending out a few thousand mails. Most of them were sent out and only a few were quarantined, so I assumed it is not working correctly. Now I have found the reason: the spam level was calculated differently, most had values about 4 and only a few had 5. As I use Spam Level 5 it was correct working. So my primary problem is solved. But I am not sure about the quarantine function. For incomming mails a Spam is move to the receivers address, but for outgoing mails it must be moved to the sender address. Where can I configure this - or is this part of proxmox's intelligence?