On Wed, 25 Aug 2021, Sabahattin Gucukoglu via Exim-users wrote:
What about if I extent this setup so that my mailer machine only
makes outbound connections to the proxy host—can I still receive
inbound mail, through a forwarded port perhaps? SSH seems like the
obvious answer, but then I’d lose sender information, yes? I could
use an inner VPN, perhaps. But something that only carries
application-layer traffic would be nicer. Exim supports SOCKS, but
not the bind method—perhaps that would be useful.
Sounds as though ETRN might be what you want.
The "real" server connects to the secondary with SMTP, gives the command
"ETRN" and the secondary then sends any waiting email down the connection.
I've never tried this so can't say much about the pitfalls or other details
but it appears to have been designed for dial-up mail servers.
--
Andrew C. Aitchison Kendal, UK
[email protected]
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