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Mail is not delivered: SASL authentication failed; server smtp.sendgrid.net

Julian Bonpland Mignaquy

Updated May 28, 2020 13:04

Applicable to:

Plesk Onyx for Linux

Symptoms

Mail is not delivered to external mail servers;
In /var/log/maillog the following entry is found:
CONFIG_TEXT: postfix/smtp[22000]: 3E2F123A41AC: to=johndoe@example.com, relay=smtp.sendgrid.net, delay=1140, delays=1139/0.11/0.48/0, dsn=4.0.0, status=deferred (SASL authentication failed; server smtp.sendgrid.net said: 535 Authentication failed: Bad username / password)

Cause

Incorrect SendGrid configuration.

Resolution

Check steps from the SendGrid configuration article and make sure, that credentials for the SendGrid account are correct: Setting up SendGrid with Postfix as a relay server

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