Missing Mail Messages

I have not been getting all my messages.  I discovered that I have not been getting invitations from a specific services.  I get mail from staffers (@eventmail.eventfarm.com) but not the invites (@invite.eventfarm.com).  I have Apache SpamAssassin on my mail server, and I have now whitelisted this address, however according to the mail trace, the invitations had been successfully sent.

OK.  I’ve tried two different support people from my mail host, and YES, my e-mail address does have a (spamassassin) spam folder.  It’s a pop3 account.  How do I get emclient to download that?  It’s full of messages that I should have received.  ARGH!