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Re: TLS certifcates are FAILing checktls test

From Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org>
Newsgroups comp.mail.sendmail
Subject Re: TLS certifcates are FAILing checktls test
Date 2026-04-18 04:09 -0400
Organization MGT Consulting
Message-ID <10rve6s$317$1@news.misty.com> (permalink)
References <10ru58h$2o41a$1@dont-email.me>

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pcla56  wrote:

> I am running ubuntu 20.04 (LAMP) server.

> The error from checktls.com is as follows

Do you mean this:
> Cert VALIDATION ERROR(S): self-signed certificate

Ignore it - or pay for a "real" cert (which has basically no advantage
for e-mail except making some "check" websites happy).  If you use
Let'sEncrypt you will get a cert which officially isn't usable as
client cert - thanks to some evil company.

> Now I have spotted one issue and that is we do not have an "admin" user 

Why do you want an "admin" user?

> I can see sendmail-{server|client}.cfg files in /etc/mail/tls but have 
> no clue on how to use them.

Those files are not from sendmail.
Maybe try a mailing list for Ubuntu?

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Thread

TLS certifcates are FAILing checktls test pcla56 <paul@vicjen.co.uk> - 2026-04-17 21:30 +0100
  Re: TLS certifcates are FAILing checktls test Marco Moock <mm@dorfdsl.de> - 2026-04-17 22:58 +0200
  Re: TLS certifcates are FAILing checktls test Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-18 04:09 -0400

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