Hello,
OK! in response to your questions. I have a domain which I purchased through A-Q domains and my site is hosted by Zen on the cPanel server and I can confirm that any email (pop3) being sent to your domain wont get any spam filtering. You can of course turn off the "catch all" mail status, which helps to some degree.
I personally think this is one area (spam filtering) that Zen offers little or no help. So like you I got pretty fed up of the volumes of spam I was receiving as I was getting 30-40 spam an hour 24/7. I looked for a more permanent solution I looked at x3 main services a) SpamCop b) Spam Arrest and c) SpamFence.
**I chose Spamfence because its free and it's pretty good too. My spam volumes have gone down drastically to 3-4 spam per 24hrs which is more acceptable. SEE:- http://www.spamfence.com Spamfence works by examining each emails header & the eXpurgate analysis filters on the spamfence servers have a very high accuracy rate of detection between clean mail & spam. Spamfence doesn't look at the emails actual contents only the header information. To set up this service all you need is x2 different email address (address1 your current domain based email account & address2 you should use your Zen normal mail address which would be something like zen11111@zen.co.uk) any email service being pointed to your cpanel server needs to be pointed at the Spamfence server first.
Works like this incoming mail from WWW>>>>>>>>>any mail to your domain email>>>>>>>>>spamfence (mail in) >>>> Filtered by eXpurgate) >>>>>>>>>>>(mail out) >>clean mail goes to Zen mail address.
**Spam & Junk & Viruses etc are voided you dont get them.
**You need to create a free account with spamfence & it takes about 24hrs before it kicks in & starts working.
Hope this might be of use?
Regards Ivan