Bug#1125132: exim4: Cannot send email to smtp.themessagingco.com.au when using CGNAT address

[Marc Haber]

On Fri, Jan 09, 2026 at 11:30:24PM +1030, Arthur Marsh via Pkg-exim4-maintainers wrote:
>I paid for a routable IPv4 address with the ISP and then experienced:

Did you also pay for useable SMTP service?

>2026-01-09 21:21:58 1ve92e-000000000vz-3GgJ => arthur.marsh at internode.on.net R=s
>marthost T=remote_smtp_smarthost H=smtp-tmc.pc5.atmailcloud.com [13.237.144.95]
>X=TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256 CV=yes DN="CN=*.t
>hemessagingco.com.au" A=plain K C="250- 377 byte chunk, total 377\\n250 OK id=1v
>eA61-00000000CT9-3wnP"

That is a successful delivery to smtp-tmc.pc5.atmailcloud.com.

Greetings
Marc

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