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The best way I have found to make sure that all the leads reach the advertiser is to give them a POP3 account that redirects to their real email address. e.g. the advertiser would have an account 103-joeblow@MyDomain.com that redirects to email@example.com. That seemed to get me past junk mail filters, and all the other issues I was having, but created a new problem.
Now everytime I sign up an advertiser I have to manually create them a POP3 account, which granted takes very little time, but it isn't exactly immediate access for the advertiser.
So finally my question: Is there a way that I can auto generate POP3 accounts using php for my VPS that is plesk using horde for email?