Sorry, I was not subscribed to the bugreport… :-( I have added
set smtp_authenticators=login and things works now! [2022-05-12 16:47:53] 5< 250-PIPELINING [2022-05-12 16:47:53] 5< 250-SIZE 52428800 [2022-05-12 16:47:53] 5< 250-ENHANCEDSTATUSCODES [2022-05-12 16:47:53] 5< 250 X-SZNEXTENSIONS [2022-05-12 16:47:53] smtp_authenticate: Trying method login [2022-05-12 16:47:53] smtp_auth_gsasl: using mech LOGIN [2022-05-12 16:47:53] Authenticating (LOGIN)... [2022-05-12 16:47:53] 5> AUTH LOGIN [2022-05-12 16:47:53] 5< 334 VXNlcm5hbWU6 [2022-05-12 16:47:53] 5> <<<base64-encoded-username>>> [2022-05-12 16:47:53] 5< 334 UGFzc3dvcmQ6 … So the problem is with the SMTP server side? Thank you very much! -- Zito
