On 1/8/2026 1:44 PM, Dennis Putnam wrote:
On 1/8/2026 11:56 AM, Wietse Venema via Postfix-users wrote:
Dennis Putnam via Postfix-users:
trouble with my ISP rejecting email generated by mailman3. I wanted to
collect the session exchange between my postfix and my ISP relay. This
is apparently not doing what was hoping. Is there some other way to
debug this?
Use debug_peer_list. It will log SMTP commands and responses.

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

The default level is enough for SMTP commands and responses.

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

    Wietse
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Thanks. I added what I think I should but nothing showed up anywhere I looked. Where is that output supposed to be logged?
I just noticed that when I run postconf -d the output for debug_peer_list is:

debug_peer_list =

Here is what I have in main.cf:

debug_peer_level = 3
debug_peer_list = smtp.att.yahoo.com
debug_peer_list = 127.0.0.1

Attachment: OpenPGP_signature.asc
Description: OpenPGP digital signature

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