Email problem on trading

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Using Pinpics trading assistant, replying to an agreed trade I got this email straight back;
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:

xx@bellsouth.net
SMTP error from remote mail server after initial connection:
host gateway-f2.isp.att.net [207.115.xx.xx]: 550-83.223.xxx.xxx blocked by ldap:ou=rblmx,dc=att,dc=net
550 Error - Blocked for abuse. See http://att.net/blocks

X's substituted for real numbers. It's the 'Blocked for abuse' part of the message that's concerning me.

Any clues what to do next?

 

[tiggermickey]

OK could you have lost connection when sent ...?Maybe the other person has a spam blocker and everything goes in spam and you get that back
I actually have gotten that before..but through earthlink,not bellsouth

 

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I did a search for the error and many people have had it, but no real answers. I've copied the message and sent it by another email account I have and it hasn't come back with the same error - yet.

Is it my email address that has been 'blocked for abuse' or theirs?

 

[tiggermickey]

It sound like theirs..their email might be over the limit for their server too
I had that with Comcast