Gmail blocking servers that don’t have a Valid IPv6 PTR Record


Gmail-block-ipv6I wanted to share an issue we’ve seen multiple reports of this week, where MDaemon customers have started receiving bouncebacks from Google mail servers.

Valid email is being refused due to PTR record failures, and it’s happening for all Gmail domains including customer registered domains that are used with Google services.
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SMTP Port 25 * Access Denied! *

Over the last few months we have had an increasing number of support calls that relate to failing SMTP connections over Internet connections.

This can happen on a range of network connections, whether it’s mobile devices on 3G or home users trying to access their MDaemon mail server. Even┬ábusinesses┬ácan find that they can no longer create outbound SMTP sessions on port 25 on their office broadband connections. Continue reading