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Alt-N Discussion Groups > MDaemon Discussion Groups > MDaemon Support > Archive > Messages randomly not accessible to random users

Parrish Reinoehl

Which Alt-N products do you use?

Most recent posts: Parrish Reinoehl

MTA-STS failure for gmail.com: STARTTLS not supported - 07:48pm Jul 1, 2020 CDT - Thanks to some suggestions from David C. at your support department, this has been fully resolved. Turns out the issue was due to the router/UTM appliance at this site not allowing TLS connections...

MTA-STS failure for gmail.com: STARTTLS not supported - 08:59am Jun 30, 2020 CDT - Thanks Aaron,
I agree, I want to get the issues resolved so STARTTLS and the new MTA-STS can be utilized.
Here is a snippet of the log file when MTA-STS was enabled and failing for delivery to gmail:

Mon 2020-06-29 08:21:20.313: 05: Attempting SMTP connection to alt1.gmail-smtp-in.l.google.com
Mon 2020-06-29 08:21:20.313: 05: Resolving A record for alt1.gmail-smtp-in.l.google.com (DNS Server: 192.168.1.15)...
Mon 2020-06-29 08:21:20.314: 05: * D=alt1.gmail-smtp-in.l.google.com TTL=(2) A=[142.250.96.26]
Mon 2020-06-29 08:21:20.314: 05: Attempting SMTP connection to 142.250.96.26:25
Mon 2020-06-29 08:21:20.315: 05: Waiting for socket connection...

MTA-STS failure for gmail.com: STARTTLS not supported - 11:04pm Jun 29, 2020 CDT - One more update. I read through the v20 release notes and found where the controls for MTA-STS (as well as REQUIRETLS). I disabled MTA-STS and email is now flowing again to gmail...

MTA-STS failure for gmail.com: STARTTLS not supported - 08:23pm Jun 29, 2020 CDT - I believe I know what the root cause of this failure is. Since upgrading to version 20 STARTTLS no longer works. Mdaemon shows that it's active and is using the correct certificate...

MTA-STS failure for gmail.com: STARTTLS not supported - 07:48pm Jul 1, 2020 CDT - I just upgraded a customer to Mdaemon v20 this weekend. Today they are having issues with mail delivery failing. It appears to be primarily to gmail.accounts...

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