On Wed, Jun 19, 2019 at 09:28:52PM +0200, sral...@gmail.com wrote:
>  Verified TLS connection established to MXhost[xxx.xxx.xxx.xxx]:25: TLSv1.1
> with cipher ECDHE-RSA-AES256-SHA (256/256 bits)

Postfix: I can verify the certificate of the remote host

> postfix/smtp[]: : to=<em...@domain.com>, relay=MXhost[xxx.xxx.xxx.xxx]:25,
> delay=2190, delays=2186/0.03/3.9/0.13, dsn=4.7.0, status=deferred (host
> MXdomain[xxx.xxx.xxx.xxx] said: 403 4.7.0 not authenticated (in reply to
> MAIL FROM command))

Postfix: The remove host does not like what I send.

This two things have nothing to do with each other.  You obviously lack
authentication, not remote verification.  Please describe your problem,
not your solution.

> relay_domains = <subdomain>

Syntax error.

> smtp_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, TLSv1.1

Don't.

> smtp_tls_protocols = !SSLv2,!SSLv3, !TLSv1, !TLSv1.1

What?

Bastian

-- 
Conquest is easy. Control is not.
                -- Kirk, "Mirror, Mirror", stardate unknown

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