another kind of email issue

[rfonseca]

One of my sites has an MX changed to the everyone.net webmail service. Recently that email is not going out and is instead ending up in the default email for that domain. I checked the MX entry and it looks fine. I tested sending an email from another domain to the problem domain and it gets delivered to the everyone.net address fine. It seems to be happening only with the vbulletin mailing features. Am I missing something?