To Whom It May Concern:
Currently the system is blocking IP 18.104.22.168 from sending mail to certain sites under your control. I’ll assume for a moment here that the site’s owners are using your built-in spam filtering without fully realizing the implications of said filters. While your tools are showing a “bogus helo”, a failed “rDNS”, and bogus “rcpt to” command for our mail server, I must point out that the error is in fact on your end.
To begin, I must point to a very old, yet very simple, tool commonly found on all major computers today: the telnet tool. If you are to type in “telnet 22.214.171.124 25” you will get this: “220 mail.mnjtech.com Microsoft ESMTP MAIL Service, Version: 6.0.3790.1830 ready at <date and time here>”. Next type a “helo” command and you will be greeted with “250 mail.mnjtech.com Hello [YOUR IP HERE]”. That’s about as simple as I can make it, but it’s as clear as day that IP 126.96.36.199 on port 25 (THE standard SMTP port) is in fact responding as mail.mnjtech.com.
If you were to actually look at the emails being sent from our system through IP 188.8.131.52 you will see a fully functional reverse DNS (rDNS) for this IP. The IP 184.108.40.206 corresponds with mail.mnjtech.com and can be found using a variety of tools, my favorite being the “host <IP>” command found on every flavor of linux.
Now, with regards to the “rcpt to” being off, I’d like to point out the standard headers from an email coming from IP 220.127.116.11 show ALL of the proper information in accordance with normal internet emailing procedures. Here is a brief summary, edited for our use:
Received: from mail.mnjtech.com (mail.mnjtech.com [18.104.22.168])
by INCOMING EMAIL SERVER (Postfix) with ESMTP id A2B4D139BFE
for <USER@DOMAIN>; Fri, 15 Dec 2006 13:48:50 -0800 (PST)
X-MimeOLE: Produced By Microsoft Exchange V6.5
Date: Fri, 15 Dec 2006 15:48:43 -0600
Unless your spam filter is looking at the message-ID of *@MNJSERVER8.mnjtech.com, which besides being a bad practice to have (you’ll probably redirect a bunch of false positives in terms of emails received), if you look at mnjserver8.mnjtech.com you will see that it resolves to the same IP address as mail.mnjtech.com (22.214.171.124).
I hope this concludes any issues regarding the delisting of our mail server from your spam filters. If you have any further questions or comments please feel free to respond to this email and I’ll get to them as soon as I can.
800-870-4340 ext. 8323
Sent: Monday, December 18, 2006 11:33 AM
Subject: Update [Incident ID: 1424158] - Unblock request 126.96.36.199
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