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