D-Link router blocking Mail SMTP and POP

hello I did set up a d-link router for a friend

she was using a different router, and everyting was working fine, now since the new D-link router was installed., she can go on line no problem but she cant send or receive mail.

I did check the settings in her computer and the smtp and pop are correct nothing has changed so im assuming it is the router blocking it.

any idea

thank you