New users not getting e-mail

[Pokerzion]

I just switched over to a new server and vbulletin. The site went live today, and we were hoping that because we needed the domain switched over to the new hosting company, e-mails weren't working (because the settings are pretty straight forward). However, when new users sign-up, they are not getting a welcome e-mail.

I've tried the -F setting, and also users do get e-mails to reset their passwords, just not the welcome e-mail. Naturally I assume it's not an e-mail setting, and something else. I've googled, and looked on here as well, but none of the answers others have received about this issue have helped us.

Any help appreciated.

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I should add that test e-mails work fine from the diagnostic area.