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Re: [ietf-smtp] own mail server: DNS / static IP / no bad reputation?

Sam Varshavchik <sam.varshavchik@gmail.com> Mon, 12 October 2020 11:04 UTC

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From: Sam Varshavchik <sam.varshavchik@gmail.com>
Date: Mon, 12 Oct 2020 07:04:17 -0400
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Subject: Re: [ietf-smtp] own mail server: DNS / static IP / no bad reputation?
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On Mon, Oct 12, 2020 at 3:34 AM Claus Assmann <ietf-smtp@esmtp.org> wrote:
>
> > (mostly) transparent outbound mail filtering so their reputation seems
>
> If STARTTLS is used, they shouldn't be able to do it, unless they
> mess with SMTP (or much worse: with TLS), right?

They intercept outbound port 25, and simply don't advertise STARTTLS.
Only STS will catch that.

Alternatively, STARTTLS existed way before easy availability of
low/free certificates, and it was not unusual for STARTTLS giving out
self-signed certs. Hardly noticed, especially since STARTTLS was
optional, and non-encrypted was always available as a fallback. The
senders has to tear down the connection and reconnect, but that was
doable, and was done.

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