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Docker SMTP fails

Hi

I’m getting the following error with my SMTP relay since we migrated to Docker based TestRail.

Sending the test email failed. Please see the following messages and server output for details:
No authentication mechanisms were tried since the server did not support any of the ones loaded. Loaded authenticators: [CRAM-MD5, LOGIN, PLAIN]

I’m not entirely sure what the problem and thus solution is?