On Wed, May 14, 2025 at 08:29:06AM +0200, Gregory Kohring via Postfix-users
wrote:
> "All outgoing mail from our network is relayed through a spam
> filtering system that may affect how certain TLS negotiation stages
> (like 250-STARTTLS) are exposed during the SMTP handshake.
>
> That said, TLS encryption is still enforced between our relay system and the
> recipient's mail servers. This means your outgoing messages are still being
> delivered securely, even if 250-STARTTLS isn't explicitly shown during your
> tests.
>
> Unfortunately, this is standard industry practice and cannot be disabled."
You may want a better ISP, possibly you might have to pay more. Here in
Melbourne AU, I'm paying an extra $AUD 5.00 per month above the stock
rate, for a static IPv4 address, and an IPv6 /48, with no SMTP filtering
(MiTM) by the ISP. If I ever need more than 2^80 IPv6 addresses, I'll
seek a better provider. :-)
https://web.archive.org/web/20230308041144/https://dilbert.com/strip/1995-06-24
--
Viktor.
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