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Postfix - send all notify_classes except failed authentication

How do I configure Postfix/Dovecot to not send errors to the postmaster regarding failed authentication? A botnet continually hammers my server, and I end up with hundreds of these emails: Transcript ...
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Cannot send email via postfix / dovecot error status=deferred (mail transport unavailable)

I am trying to setup a mail server with postfix/dovecot/maria DB on centos 7 and have seem to hit a roadblock. I am not able to send emails to internal users and the logs suggest "mail transport ...
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IMAP Dovecot cannot connect

I am trying to set up my own mail server (for 'fun'). I followed this tutorial to the bone. But I get this error message: imap-login: Disconnected (auth failed, 2 attempts in 9 secs): user=<...