Can get on web but cannot get email

I am using a dlink router dl614+. I can access the web both wired and wireless but cannot receive email on two of my three computers. The only computer that can still get email is wired. Is the router going bad or is there some reason for the behavior all of a sudden? Thanks for any help.

In my oppinion it doesn't have anything to do with wireless connectivity. I you are able to surf the web it's most apparently something specificly with your email accounts or email configuration.

If this router is set to factory settings I don't believe it's filtering any packets.