I've searched the forums and am still feeling a lil' stuck - any support or guidance would be much appreciated.
We host our own mail server (running zimbra Version 5.0.9_GA_2533.RHEL5_64.FOSS ) and I've noticed in the last 3 weeks our spam has increased.
Prior to being on version 4.5 we rarely had any spam and after upgrading to v5 - almost next to no spam was received. I assumed this was down to our spam filter / Spam training accounts.
Over the last few weeks pretty much all my users are getting lots of spam that seems not to get filtered out and almost immediately goes into the inbox.
i've checked the server status and monitor - running as normal (data is stale even after refresh). I've also checked the spam/ ham accounts (both have empty inboxes- im assuiming this is normal).
any guidance to isolate this issue and a starting point to find out where the issue may lie would be super appreciated!
many thanks in advance