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Alt-N Discussion Groups > MDaemon Discussion Groups > MDaemon Support > Archive > MTA-STS failure for gmail.com: STARTTLS not supported

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MTA-STS failure for gmail.com: STARTTLS not supported

[Reinoehl, Parrish]
Parrish Reinoeh…
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Posts: 22
Parrish Reinoehl - 02:25pm, Jun 29 2020

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. The error is 'MTA-STS failure for gmail.com: STARTTLS not supported'.
I assume this is due to the new MTA-STS implementation in version 20. I need to resolve this ASAP. At the very least I need to know how to disable MTA-STS on the Mdaemon server side. I dug through all of the settings and found zero mention of MTA-STS anywhere.

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Parrish Reinoehl - Jul 1, 2020 7:48 pm (#5 Total: 5)  

 

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Parrish Reinoeh…
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Newbie
Posts: 22
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. The site is using Untangle and had the Spam Blocker application installed and active. Digging through the settings we found, under the Advanced SMTP Configuration, and option titled 'Allow and ignore TLS sessions'. Enabling that option was the fix. Now STARTTLS is presenting as a command and MTA-STS is also working correctly when sending emails to gmail.com.
Might be something good to put in the Mdaemon FAQ?



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