Giving Error Upon Sending Out Messages

I've frequently been getting an error when attempting to send out messages. I get an error email that is as follows:

From: System Administrator
Subject: Undeliverable: LearnOutLoud Followup

Your message did not reach some or all of the intended recipients.

Subject: RE: LearnOutLoud Followup
Sent: 11/29/2006 2:01 AM

The following recipient(s) could not be reached:

'' on 11/29/2006 2:01 AM
550 Your HELO string is incorrect

I have know idea what the HELO string is. Any ideas on how to reconfigure this?
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gopal_krishnaConnect With a Mentor Commented:
This explains that this issue is with the DNS problem on your computer. Kindly check the DNS on your machine and  please go through the link mentioned below:

Gopal krishna K
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