I have the misfortune of getting all bounced and replys to the outgoing forum e-mails and I can tell you I know before many others when their inbox is over quota or when they mistype their e-mail address or when they cancel an account and forget to change it here.
That sucks. When I used to teach I could not believe how many students kept their inboxes FULL.
oh one more thing If I have some sort of filter in my email system I did not put it there. I checked the security section (Im not really good at computers) and it is set for the minimum of two settings??
I am guessing that when the site emails you via the email button it is not getting filtered. I would get with my ISP and see if they are running spam filtering software, and how to check to see what is being filtered. As noted above, you may have to set up a separate email for the site, I know you can pop a free hotmail acct, where I think you gotta pay to pop a yahoo acct.