On Mon, May 01, 2023 at 04:46:20AM +0200, Michael Grimm via Postfix-users wrote:
> > When I open a raw socket to the remote server on port 25 using
> > telnet, I am able to connect and see the server announce itself […]
>
> Then, do continue to provide all essential *FURTHER* commands via
> telnet and see and report what happens.
There's no point in any of that. The actual problem is TCP connection
establishment, not SMTP chit-chat. The OP's various tunnels may behave
differently when tested by hand, but regardless no SMTP dialogues over
established connections shed any light on connection failure.
To debug networking issues, use "tcpdump" to record and analyse traffic.
--
Viktor.
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