It has been a while since I have worked with Postfix configs but I think 
there is a setting called delay_warning_time that you're looking for.

http://www.postfix.org/postconf.5.html#delay_warning_time

It looks like you just need to set that to a zero value.

On 06/07/2021 7:36 pm, Jon Schewe wrote:

> When postfix can't deliver a message it will keep retrying for up to 5
> days. When this happens an email is sent back to the sender that says
> the email was delayed and will be retried. On some of my systems the
> sender and recipient are the same address (for various reasons) and
> this email about the message being retried creates a bit of a feedback
> loop. Does anyone know how to configure postfix to not send the message
> to the sender that the email is delayed?
> 
> Thanks,
> Jon
> 
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