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Oracle Linux: Postfix GMAIL Relay Failed: "SASL authentication failed; server<IP_Addreess>] said: 535-5.7.8 Username and Password not accepted" (Doc ID 2526431.1)

Last updated on AUGUST 29, 2023

Applies to:

Linux OS - Version Oracle Linux 7.4 and later
Linux x86-64


Below messages are observed in /var/log/maillog:


Here the message "SASL authentication failed; server[<IP_ADDRESS>] said: 535-5.7.8 Username and Password not accepted." is the key which indicates the GMAIL SMTP server denied authentication.



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