Well, acknowledging the problem is a start.
Believe me, I know what you mean, though....so many problems involve something so simple; so it tends to be the most likely case when the problem is recourring. I've no doubt that spam filtering accounts for well over the majority of the issue; but I'm trying to point to something else that seems to be stuck in the gears.
To figure out this kind of problem, though, we need feedback. That was primarially why I asked for the other guy to post what email account he had that didn't work. Unless someone feels like personally filtering through each and every obscure email service on the internets; the best solution is to simply document what is and isn't working - then try to discern a pattern in it.
In my own case, AIM failed.
However, from what I've heard so far, hotmail is guranteed to work.
I'm sure that compiling a list of what worked for the people here; and finding out what the people with issues are using will allow a more accurate filter for those who don't know how to email; and those who are hitting another problem entirely.
