testsaslauthd “connect() : No such file or directory 0”. | postfix | postfix/smtpd[11571]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory

the problem is simple

first we have to delete

rm -rf /var/run/saslauthd

and after that we can create the symbolic link

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