Problem with email being rejected by recipients SPAM filter

Hi,
    I have a hosting account held with justhost, who have been very good up to now, however recently I am seeing some of my emails being rejected by some recipient email systems.  I have configured an SPF record via Cpanel, the erorr I receive back is:

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. The following address(es) failed:

  spamcheck@sitesell.net
    SMTP error from remote mail server after end of data:
    host mail2.sitesell-special.com [66.43.48.12]:
    554 mail server permanently rejected message:
    your message was rejected by our spam filter (#5.7.1)

------ This is a copy of the message, including all the headers. ------

Return-path: <john@mydomain.net>
Received: from [92.14.251.33] (helo=Laptop1)
      by fst07.justhost.com with esmtp (Exim 4.69)
      (envelope-from <john@mydomain.net>)
      id 1QKTzk-000279-6y
      for spamcheck@sitesell.net; Thu, 12 May 2011 06:23:52 -0500
From: "John - mydomain.net" <john@mydomain.net>
To: <spamcheck@sitesell.net>
References:
In-Reply-To:
Subject: FW: Example of email
Date: Thu, 12 May 2011 12:23:45 +0100
Message-ID: <00be01cc1097$101d8d20$3058a760$@dcbcomputing.co.uk>
MIME-Version: 1.0


my real email address and domain have been masked with mydomain.net.

Can anybody offer any tests to complete, or guidance?

Thanks
damianb123Asked:
Who is Participating?
 
RedLondonCommented:
Yes.  The "dirty" IP address is in the headers of the email which is scanned and then rejected.

Check it - try sending an email via webmail (which typically doesn't show your local IP address), or borrow a neighbour's wifi connection or nip out to a McDonalds/Wetherspoons/etc with your laptop and send a mail from Outlook using the same account and server, or if you have one, connect using a 3G modem and try the same.
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ThorrssonCommented:
First step should be to go to www.mxtoolbox.com and search your domain to see if you have been blacklisted.
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RedLondonCommented:
The server's IP address is listed on the Backscatter RBL - http://www.backscatterer.org/?ip=66.43.48.12

Chances are, the recipient server is checking that, seeing the listing, and blocking your email.
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damianb123Author Commented:
Thanks Thorrsson,
   I checked all details and the domain name is not blacklisted, nor are there any SMTP issues with RDNS configured correctly, as per the below:

 OK - 184.154.75.50 resolves to cx94.justhost.com
 OK - Reverse DNS matches SMTP Banner
 0 seconds - Good on Connection time
 Not an open relay.
 2.839 seconds - Good on Transaction time

Any other ideas?

Thanks
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damianb123Author Commented:
RedLondon,
       Apologies, that IP address is my home broadband connection, not the IP address of the sending email server.  My email server sits on 184.154.75.50, which is clean.

if I am connecting to my hosted email server and sending mail, my personal broadband at home IP address would not matter, would it???

Thanks
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damianb123Author Commented:
RedLondon, also this is the recipients details, who has rejected my email:

host mail2.sitesell-special.com [66.43.48.12]:

Regards,

Damian
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ThorrssonCommented:
Is this happening with multiple recipients or just one?
If it is just one, you could contact them and ask to be whitelisted
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damianb123Author Commented:
Hi,
    It is anybody who is using Mimecast by the looks of things, however we have tried advising them they need to whitelist us, however many are huge international companies and when you mention what is required, they're not interested, but we would like to get these emails through.  It worked until hosts were switched recently, however I see nothing wrong with the email header information, unless I missed something!

Damian
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RedLondonCommented:
OK, sorry, I took the wrong IP address.  More clear when using your home connection's IP: it is listed with Barracuda, Spamhaus and Senderscore (but I've not heard of Senderscore before so would imagine it's one of the first two).

I'm checking via dnsstuff.com, it's a subscription service so the link to its test page may not work: http://www.dnsstuff.com/beta/?view=toolrun&toolName=SpamDatabaseLookup&target=92.14.251.33

Barracuda is http://www.barracudanetworks.com/reputation/?pr=1&ip=92.14.251.33
Spamhaus is http://www.spamhaus.org/query/bl?ip=92.14.251.33

How do you connect?  Either it's a static IP address in which case perhaps something on your connection has triggered the listing, else it's a dynamic IP address in which case the problem is likely not of your doing.  Turn your router off (or disconnect it from the phone line) for 10-20 minutes and reconnect: with some luck you'll be assigned a different IP address.

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damianb123Author Commented:
RedLondon, are you saying that although my email server is hosted in the US, and my outlook client connects to this server to send my email, if my local IP address is blacklisted, this is used by the recipient server, although I am sending through my host in the US?

Thanks
Damian
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damianb123Author Commented:
great, that sorted it out, it was a bad IP address from BT.

Cheers
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RedLondonCommented:
Great... if you can, you should try getting a static IP address from your ISP

Be will issue one free on their Pro and above accounts, and Zen issue them by default.  Both allow you to set reverse DNS (ie you can get your IP address to resolve to something.yourdomain.com instead of host-92-14-251-33.as43234.net) which looks much tidier and makes for much easier connections back to your office for remote desktop, locally hosted services etc.
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