What to do when you get warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory

If you get the problem below, trimmed and highlighted in bold:

SASL authentication failure: cannot connect to saslauthd server

At least run the command below to see if the service is started:

service saslauthd status

Full log example:

Dec 7 10:30:49 eyou postfix/smtpd[3843462]: connect from unknown[a.b.c.d]
Dec 7 10:30:49 eyou postfix/smtpd[3843462]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory
Dec 7 10:30:49 eyou postfix/smtpd[3843462]: warning: unknown[a.b.c.d]: SASL LOGIN authentication failed: generic failure
Dec 7 10:30:49 eyou postfix/smtpd[3843462]: lost connection after AUTH from unknown[a.b.c.d]
Dec 7 10:30:49 eyou postfix/smtpd[3843462]: disconnect from unknown[a.b.c.d] ehlo=1 auth=0/1 commands=1/2

Note also generic failure

Reference

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