[Kolab-devel] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host localhost.

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

<hartsuiker at kolabsys.com>: host mx01.kolabsys.com[10.1.0.2] said: 550 5.1.1
    <hartsuiker at kolabsys.com>: Recipient address rejected: User unknown in
    relay recipient table (in reply to RCPT TO command)
-------------- next part --------------
An embedded message was scrubbed...
From: devel at lists.kolab.org
Subject: OBS Administrator ERROR
Date: Sun, 27 May 2018 03:00:30 +0000
Size: 1433
URL: <http://lists.kolab.org/pipermail/devel/attachments/20180527/8faca116/attachment-0001.mht>