======== Required information ====
- iRedMail version: 0.8.6
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Centos 6.5
- Related log if you're reporting an issue:
====

Hi,
I have been running iRedmail for well over a year now. We're very happy with it.

Currently the server tags spam, and then delivers it to the users' mailbox. Sieve then takes over and moves it into the 'Spam' folder.
This works well. Here is an example from /var/log/maillog

Apr 23 07:10:52 xxx amavis[5078]: (05078-11) Passed SPAM, MYUSERS LOCAL [a.a.a.a] [b.b.b.b] <spammer@aaa.bbb> -> <localuser@localdomain.ccc>, Message-ID: <spammer@aaa.bbb>, mail_id: xxxxxxxxxxxx, Hits: 12.275, size: 3962, queued_as: xxxxxxxxxxxx, 39 ms

If a forwarding address is set in iRedadmin-Pro, this tagged spam is then forwarded on to a remote address, where it is assumed that our IP is the source of spam.
I would like to continue using the tag and pass, but only deliver locally - never forward spam, even when tagged.

Can someone suggest any preferred methods for achieving this?
I'm thinking of using a separate instance of amavisd to scan outgoing email and rejecting the spam there. Perhaps there is a simpler method?