I think you answered you question
I did read on the hostmonster site where some providers block certain ips (like hostmonster) to protect against spam
is host monster your domain name registrar as well as webhost?
you can always use google apps for your email, I use it and it works fine.
google.com/a/
and read this for the setup of google apps for phpbb3
http://startrekguide





by: compfixer101Posted on 2008-11-22 at 18:41:24ID: 23023380
I am assuming your using phpbb3
now, what are your email settings in the ACP?