regarding spam block - there's some services out there that block without telling ya. GoDaddy is one of them.
friend of mine had her godaddy hosted site set with all spam filters turned off (i know cause she gave me her login to her control panel to make sure about a few things and that's one thing i checked for her) yet, my emails were getting bounced as spam. So, there was a filter that godaddy was running and not telling folks about.
dunno who your email is through, but it might be what's happening.