postfix/smtpd[]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory

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Issue on Debian 8 + virtualmin:

ln -s /var/spool/postfix/var/run/saslauthd /var/run/saslauthd
chown root:sasl /var/spool/postfix/var/run/saslauthd
usermod -a -G sasl postfix

sudo /etc/init.d/postfix restart
sudo /etc/init.d/saslauthd restart

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