Don't you think it would be a good idea to pay attention to, and fix the error messages from your log file?
i.e.
Oct 16 16:30:09 mail postfix/smtpd[31002]: connect from unknown[12.173.5.11]
Oct 16 16:30:12 mail postfix/smtpd[31002]: warning: SASL authentication problem: unable to open Berkeley db /etc/sasldb2: Permission denied
Oct 16 16:30:12 mail postfix/smtpd[31002]: warning: SASL authentication problem: unable to open Berkeley db /etc/sasldb2: Permission denied
Oct 16 16:30:12 mail postfix/smtpd[31002]: warning: unknown[12.173.5.11]: SASL LOGIN authentication failed: authentication failure
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