debian – Postfix & SASL authentication failure


I want to enable SASL authentication under Debian Buster. For this I follow these instructions: https://wiki.debian.org/PostfixAndSASL

This all works fine, but after each restart Debian “forgets” the symlink…

ln -s /var/spool/postfix/var/run/saslauthd   /run/saslauthd

which leads to an error message.

Sep  6 15:51:31 postfix/smtpd[1519]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory
Sep  6 15:51:31 postfix/smtpd[1519]: warning: SASL authentication failure: Password verification failed
Sep  6 15:51:31 postfix/smtpd[1519]: warning: unknown[xxx]: SASL PLAIN authentication failed: generic failure
Sep  6 15:51:31 postfix/smtpd[1519]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory