It came to our attention this morning that email from Gmail accounts was not getting through to our Hosted Email customers. After running every test we could think of we discovered Gmail’s servers were failing TLS negotiation with SpamTitan, and not failing back to unencrypted SMTP. We have temporarily disabled TLS support on our SpamTitan server and mail is now coming through again. Any messages sent from Gmail since we restored SpamTitan yesterday morning will be delivered to your inboxes shortly.
This issue may also have affected some other email providers, though Gmail is the only major provider we are aware of that was behaving this way.