Re: Hide local IP from non delivery notifications

[Claudio Corvino]

Ok thanks for your answer but I have another question: if I reject the e-mail instead of sending the non delivery notification, how can a "good" user be notified of the fact that his e-mail was not delivered?

Claudio

On 14/02/23 19:48, dove...@ptld.com wrote:

I have an external MTA configured with Postfix that delivers email to an internal IMAP/LMTP

Dovecot server configured to bind an LDAP to check if users exist.

You should have postfix do the checking for whether or not users exist
and then have postfix reject and deny the message.  Then you don't

care because the IP of the postfix server is almost certainly your MX server.

Plus backscatter. Sending a fail notification back to the sender (vs rejecting) puts your mail server at risk of sending spam to email accounts that had their address forged. And thus maybe yoru server being added to a spam blacklist.

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