I have a client who has had a domain for a long time now. Due to this, they receive mountains and mountains of SPAM (about 40 per minute on average, 24/7).
I have Exchange 2003 running on its own server (a pretty good Hp Proliant). I used to have GFI Mail Essentials running on the same server. I found though that the filter put so much load on the server, due to the volume of spam, it was impacting the performance of the server.
I installed GFI on a separate box, and that takes care of SPAM before it gets to the mail server. The firewall routes mail to the 'GFI box', and then a connector forwards it to the email server. However, I am facing a new challenge, and I am worried I created it.
It appears, when SPAM flow is at its highest (sometimes multiple spams a second), 'real' emails get queued and take up to an hour to get delivered.
Does having this filter put limitations on the amount of connections I can accept at one time?
Will the performance of the GFI box put limitations on things (it is a std P4 box).
Would something like a Barracuda help matters?
Any other general thoughts/ideas?
Help much appreciated,