Urgent - Mail problem!!

I'm using everyone.net mail to provide free e-mails accounts to my members. Mail works fine I can sent and receive without any problem.

http://mail.certifyexpress.com

The problem is then I use vBulletin to sent e-mail for lost username and accounts it won't sent to any @certifyexpress.com e-mail holders. But it works fine with @hotmail.com and my other pop accounts.

What should I do to correct this?

 

 

 

 

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