On 24.02.23 20:45, winnie hw wrote:
When the peer MTA can't accept messages, my local postfix will retry
delivery for a few days.

My question is,

1) how can I shorten the retry time?

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

2) when the first delivery fails, I want to notify the sender user, how to
do it?

postfix notifies after specified time, not after amount of delivery attempts:

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


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