I would recommend that you remove your IP from that post when you're done asking for support, mainly because it'll make things a hell lot easier
for script kiddies.
It is not black magic to retreive an IP address, but that surely doesn't mean we need to hand the key to the thieves

Perhaps it's an issue on either side of the forum.
It could be, that your IP is blacklisted on one of the many providers that searches for spammers, perhaps GGGZ uses a more restrictive
provider for your address.
I had that particular issue, too.
That's why I opted to go with Google Apps, has been doing wonders for me and my email traffic for many months now.