my site is for diet and weightloss, and hosted by Voda...
I posted a while back about being swamped by spam in Webmail - and I think I've figured out the solution. If you use Horde, then go to Control Panel, then Mail (NOT Webmail) and Enable Spam Assassin. I found that once my email address was jacked by the spam merchants, then the spam went ballistic, was starting to get 60 a day or so, and this number would probably have increased as the address is sold further.
But with SA activated, it's now almost zero! And I tested it: normal email gets thru fine.
This solution is only for a lone email address, eg. email@example.com - NOT forms. That is addressed elsewhere in other posts :-
Well, hope this helps others - now it doesn't matter how much spam is sent to one's Inbox - you don't see it! LOL.