WHat does 550 Currently Sending Spam bounce back email message mean?

This message was created automatically by mail delivery software.

A message that you have sent could not be delivered to one or more recipients.  This is a permanent error.  The following address failed:

  <fan@cxa.com>: 550 Currently Sending Spam See:
http://www.sorbs.net/lookup.shtml?xxx.xx.xx.xx)

I also did telnet and got different message:
Telnet mail.cxa.com 25
mail from:kk@ms.com
rcpt to:gg@cxa.com

got 451 DEFER greylisted (greylist)

okamonAsked:
Who is Participating?
 
cperry71Connect With a Mentor Commented:
Sorry, yes the cxa.com is on a blacklist called AHBL   -- The Abusive Hosts Blocking List

www.ahbl.org

from mxtoolbox.com:


SuperTool Beta
Command:
  blacklist:72.167.238.201     blacklist    


 We notice you are on a blacklist.  Click here for some suggestions  



Checking 72.167.238.201 against 105 known blacklists...
Listed 1 times with 5 timeouts.

Blacklist Status Reason TTL ResponseTime

AHBL      LISTED GoDaddy - EID-1001 - Continued hosting of spam/hate sites, ignoring abuse

Return codes were: 127.0.0.10 13476 203
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cperry71Commented:
That means that someone got a virus in you network and started spamming from your exchange server address.  You've been listed as a spammer and will be blocked by organizations using spam filters.

Once you have cleaned up the problem you can go to those spam lists and request to be taken off.  

Here's a place to start:
http://www.mxtoolbox.com/

type in you public IP for your email server.  It will check against spam filters.  If you are listed on one the lists you can click on it and request to be removed.  Be careful because they only do it so many times so make sure you environment is clear of any spamming.  

let me know what you come up with.
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okamonAuthor Commented:
my network? or the recipient's network?
the recipient's network is cxa.com
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okamonAuthor Commented:
thanx.
> someone got a virus in CXA network and started spamming from CXA exchange server address.  You've been listed as a spammer and will be blocked by organizations using spam filters.

I understand that cxa will have problem sending out emails as they will get blocked by organization using the spam filters.

But in my case, I am sending email to CXA, why I got this bounce back message?
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cperry71Commented:
Did you get any other response from thier mail server like a challenge email?  You might try sending an email twice in a row.  

See this article about greylisting:
http://www.greylisting.org/

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okamonAuthor Commented:
Ah!! actually I was wrong. It was the user from CXA trying to send us the email.
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