Comments (3)
kayrus
commented on May 27, 2024
1
@ditschedev I wouldn't say that 465 is deprecated. It was in RFC-6409, but then this statement was revoked in the recent RFC-8314, see https://serverfault.com/a/957769/176975
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kayrus
commented on May 27, 2024
You mixed up SMTPS pure TLS protocol (usually 465 port) with StartTLS over plain SMTP (587).
To run server with StartTLS you need to use ListenAndServe method and openssl s_client -starttls smtp -connect relay.example.com:587 should work fine.
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ditschedev
commented on May 27, 2024
Thanks @kayrus.
Yeah I got irretated. Reason for that was also, that trying smtps over 465 (though its deprecated) didn't work because of a mistake in the GetCertificate func in my tls.Config. Managed to fix it and StartTLS over SMTP now works like a charm!
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Related Issues (20)
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- Valid Reverse-path getting rejected with 500 5.5.4 Unknown MAIL FROM argument HOT 1
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