Email troubles

WordPress emails me whenever a new comment is made, or when someone registers, or when someone fills out my contact form. However, a while back i switched my MX records so i could use gmail as my domain’s mail server, and ever since then i get NO mail from wordpress. People leave comments, and i never know about it… people fill out my contact form and i never see it. Has anyone had this issue before? I’ve looked through as many of the wordpress settings/options that i can think of/find, and don’t see anything that looks like it can help.

i would appreciate any help! Thanks…

-keaven