It really sounds like they didn't have the original smtp server setup correctly if all they said that changed was the hardware. You gotta have relay turned on for email to work, most server admins turn it off to fight spam. You can allow relay from just the ip of your forum tho to keep spam down and allow your forum to work.

Glad you got it working <img src="https://www.ubbcentral.com/boards/images/graemlins/smile.gif" alt="" />

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