Unable to send an email: 535 5.7.8 Error: authentication failed: authentication failure

Created:

2016-12-18 06:50:51 UTC

Modified:

2017-08-08 13:12:35 UTC

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Unable to send an email: 535 5.7.8 Error: authentication failed: authentication failure

Applicable to:

  • Plesk Onyx for Linux

Symptoms

Unable to send an email, following can be found in /var/log/maillog :

Dec  4 06:06:34 servername postfix/qmgr[6224]: DA7FB101118C: from=<plesksupport@example.com>, size=927, nrcpt=1 (queue active)
Dec 4 06:06:34 servername postfix/error[25863]: DA7FB101118C: to=<testaccount@gmail.com>, relay=none, delay=0.1, delays=0.1/0/0/0, dsn=4.7.8, status=deferred (delivery temporarily suspended: SASL authentication failed; server someexternalserver.com [203.0.113.2] said: 535 5.7.8 Error: authentication failed: authentication failure)

relayhost is configured in /etc/postfix/main.cf :

# cat /etc/postfix/main.cf | grep  "relayhost ="
relayhost = someexternalserver.com

Cause

Issues on someexternalserver.com side.

Resolution

  1. Contact owner of someexternalserver.com to check the issue.

2.1. relayhost can be disabled by commenting it in /etc/postfix/main.cf

    # cat /etc/postfix/main.cf | grep  "relayhost ="
#relayhost = someexternalserver.com

2.2. Restart postfix:

    # service postfix restart
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