Merhaba arkadaşlar,

Plesk panel kullanıyorum.
Bazı yerlere mail gönderemiyorum, aşağıdaki hatayı alıyorum:

This is the mail system at host sunucu.ndemir.com.

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

<tasci.m@web.de>: host mx-ha03.web.de[213.165.67.104] refused to talk to me:
554-web.de (mxweb004) Nemesis ESMTP Service not available 554-No SMTP
service 554 invalid DNS PTR resource record
Reporting-MTA: dns; sunucu.xxxx.com
X-Postfix-Queue-ID: 1F63541B5F
X-Postfix-Sender: rfc822; mail@xxxx.com
Arrival-Date: Thu, 22 May 2014 14:26:02 +0300 (EEST)

Final-Recipient: rfc822; tasci1@web.de
Original-Recipient: rfc822;tasci1@web.de
Action: failed
Status: 4.0.0
Remote-MTA: dns; mx-ha03.web.de
Diagnostic-Code: smtp; 554-web.de (mxweb004) Nemesis ESMTP Service not
available 554-No SMTP service 554 invalid DNS PTR resource record




Sorun nedir, ne yapmam lazım?