Errror when sending email to valid mx hosts

Errror when sending email to valid mx hosts

Hi,

When I was using my email account to send email to hackers@lists.theslinux.org I got strange error as the transcript below. 72.5.230.100 is not any of our servers, we haven't any idea why it comes to return message.

Pls. take a look.

Thanks,


====== transcript

From: mailer-daemon@mail.zoho.com
To: kyanh _at_ theslinux.org
Subject: Undelivered Mail Returned to Sender
Date: Tue, 07 Jan 2014 22:35:30 -0800
User-Agent: Zoho Mail
X-Mailer: Zoho Mail

This message was created automatically by mail delivery software.
 A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

hackers@lists.theslinux.org Invalid Address, ERROR_CODE :550, ERROR_CODE :Reverse DNS lookup failed for 72.5.230.100 (deferred)


 Received:from icy.bar (l00s3r.theslinux.org [199.180.254.75]) by mx.zohomail.com
    with SMTPS id 1389162870231826.2522936483829; Tue, 7 Jan 2014 22:34:30 -0800 (PST)
 Message-ID:<20140108133425.62816ceb@icy.bar>
 Date:Wed, 8 Jan 2014 13:34:25 +0700
 From:"Anh K. Huynh" <kyanh a_t_ theslinux.org>
 User-Agent:l00s3r
 To:hackers@lists.theslinux.org
 Subject:Re: [theslinux-hackers] Thời gian Họp mặt nhóm dự án TheSLinux
 Content-Type:text/plain; charset=UTF-8