no SASL authentication mechanisms
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About
"no SASL authentication mechanisms" is an error message generated by Dovecot. Depending on the cause, it may be preceded by a "Connect to private/dovecot-auth failed: No such file or directory" message.
It means that Dovecot either has no SASL methods configured, or else that none of the ones configured are working properly.
Example
From /var/log/mail.info:
Jun 8 07:43:05 rizzo nss-mysql[14459]: connect from monitor.therealms.net[64.62.231.70] Jun 8 07:43:06 rizzo nss-mysql[14459]: warning: Connect to private/dovecot-auth failed: No such file or directory Jun 8 07:43:06 rizzo nss-mysql[14459]: fatal: no SASL authentication mechanisms Jun 8 07:43:07 rizzo postfix/master[1906]: warning: process /usr/lib/postfix/smtpd pid 14459 exit status 1 Jun 8 07:43:07 rizzo postfix/master[1906]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling