[Paul M]

Originally Posted by pattycake

Paul... vb3, vb4, vb8000... it will happen on any vb version that puts anything other than your server as the from (ie, the sender).

The next time one bounces, go look at the header... you'll see the FROM issue.

That wasnt the issue, as I said, it was rejecting all e-mails, the vast majority of them being subscription e-mails, which come from the sender domain.

Basically gmail has become very picky/sensitive to the slightest error. I went through our whole email set up and found a couple issues, one of which I suspect was probably the culprit, but Im not going to reverse them to confirm. Basically our IPv6 reverse dns was incorrect, but I dont think that was the problem, more likely was that the domain in our MX record (mail.mydomain.com) was pointed to a CNAME record (it CNAMED to mailserver.mydomain.com). Apparently this is not RFC compliant, so I changed them to use the direct server name which is defined as an A record.