On Sun, Apr 30, 2023 at 03:26:24PM +1000, Sean Gallagher via Postfix-users 
wrote:

> from smtp.c: debug_peer_check(request->nexthop, "noaddr");

That is not the only check:

    src/smtp/smtp.c:        debug_peer_check(request->nexthop, "noaddr");
    src/smtp/smtp_session.c:    debug_peer_check(host, addr);

> The string being compared to debug_peer_list is the nexthop.

Only in that call.  The additional call in smtp_session.c checks the MX
hostname and IP address (either matching is sufficient to enable more
verbose logging).

The debug_peer_level is equivalent to specifying that many "-v" options,
but only temporarily for traffic with the peer in question.  None of
this will be helpful in this case.

> have you tried debug_peer_list = example.com

The OP is wasting his time and yours.  The TCP connections are timing
out, and enabling debug_peer_list, will just drown that signal in more
noise.

-- 
    Viktor.
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