Martin, your mail server is badly configured (broken):-



Begin forwarded message:


From: mailer-dae...@britvault.co.uk (Mail Delivery System)
To: skin...@britvault.co.uk
Subject: Undelivered Mail Returned to Sender
Date: Fri, 16 Nov 2018 12:17:13 +0000 (GMT)

This is the mail system at host teak.britvault.co.uk.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<mar...@sukany.cz>: host server.sukany.cz[89.221.217.40] said: 530 5.5.1
    Invalid command: Must issue a STARTTLS command first (in reply to MAIL FROM 
command)

From: Craig Skinner <skin...@britvault.co.uk>
To: Martin Sukany <mar...@sukany.cz>
Subject: Re: Vacation with smtpd doesn't work in 6.4
Date: Fri, 16 Nov 2018 11:31:52 +0000


Try the OpenSMTPd list Martin.

http://www.OpenSMTPd.Org/list.html

Cheers,
-- 
Craig Skinner | http://linkd.in/yGqkv7
Reporting-MTA: dns; teak.britvault.co.uk
X-Postfix-Queue-ID: 42xGL107FCzVd
X-Postfix-Sender: rfc822; Skinner@Britvault.Co.UK
Arrival-Date: Fri, 16 Nov 2018 11:32:23 +0000 (GMT)

Final-Recipient: rfc822; martin@sukany.cz
Original-Recipient: rfc822;martin@sukany.cz
Action: failed
Status: 5.5.1
Remote-MTA: dns; server.sukany.cz
Diagnostic-Code: smtp; 530 5.5.1 Invalid command: Must issue a STARTTLS command
    first
--- Begin Message ---
Try the OpenSMTPd list Martin.

http://www.OpenSMTPd.Org/list.html

Cheers,
-- 
Craig Skinner | http://linkd.in/yGqkv7

--- End Message ---

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