Postfix: null route messages to specific recipient

WHT newbie here.

We have a custom application that sends notification to a hardcoded email address external to our domain, with the sender being the address of the user currently logged in.

This address is no longer valid, so each time a notification is sent, a bounce is sent back to the user of the application indicating this.

This is a legacy application and do not have access to the source code.

Is there any way to simply "null route" messages sent to this recipient, ie: notify@external-domain.com.

I have tried using the following in main.cf:

smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/blacklist_recipients, permit_mynetworks, reject_unauth_destination

With blacklist_recipients containing:

notify@external-domain.com REJECT


but this still generates a bounce. I would like there to be no bounce for this address. Other addresses for external-domain.com still need to function though.

Thank you for any insight!

 

 

 

 

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