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Hi
After i send an email i receive something like this,

Undelivered Mail Returned to Sender

This is the mail system at host ab1insurancebrokers.co.tz.

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

<p.mwanga@p4se.com>: host mx00.kundenserver.de[212.227.15.134] refused to talk
    to me: 554-kundenserver.de (mxeue002) Nemesis ESMTP Service not available
    554-No SMTP service 554 invalid DNS PTR resource record

Reporting-MTA: dns; ab1insurancebrokers.co.tz
X-Postfix-Queue-ID: 0FB0D143959
X-Postfix-Sender: rfc822; root@ab1insurancebrokers.co.tz
Arrival-Date: Wed, 17 Sep 2014 11:10:09 -0400 (EDT)

Final-Recipient: rfc822; p.mwanga@p4se.com
Original-Recipient: rfc822;p.mwanga@p4se.com
Action: failed
Status: 4.0.0
Remote-MTA: dns; mx00.kundenserver.de
Diagnostic-Code: smtp; 554-kundenserver.de (mxeue002) Nemesis ESMTP Service not
    available 554-No SMTP service 554 invalid DNS PTR resource record

Subject     hi
From     root@ab1insurancebrokers.co.tz
To     p.mwanga@p4se.com
Date     Today 08:10

first mail