I have noticed that notifications of new topic posts to at least one Forum that I watch has not come through - Microsoft Windows. This forum shows the latest post on 11th Feb and the last notification I received was on 6th Feb. As far as I can tell I have not changed my profile and I continue to receive emails from the account I use for GZ notifications.
In the last couple of days I've noticed that I haven't received any reply notifications, but when I visit the forum there are replies to threads that I've subscribed to. I use Gmail and I've checked my spam folder.
This should be fixed now. Due to the upgrade to new servers there was a misconfiguration in the FQDN for the mail server, not matching the reverse DNS result. This has now been fixed and should get these emails through the spam blockers.