smtp;554 invalid data encoding [LF.CRLF]

I have this Exchange 2003 SP2 distribution list. Some of the members of the list are external users with an external email address (yahoo, AOL, Comcast some other companies etc). Every time someone in the distribution list send a mail, the mails to the users at Comcast bounced back with the following error message:
Reporting-MTA: dns;
Received-From-MTA: dns;
Arrival-Date: Wed, 8 Nov 2006 15:56:27 -0500

Final-Recipient: rfc822;
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;554 invalid data encoding [LF.CRLF]
X-Display-Name: my name
Is there any particular reason why those users cannot receive emails from the distribution list ?
What does invalid data encoding [LF.CRLF] means anyway?
Any help will be appreciated
Who is Participating?
Computer101Connect With a Mentor Commented:
PAQed with points refunded (500)

EE Admin
i love this explanation of LF CRLF ....i hope u will also find it intresting

as to how to solve ur problem....try sending them in plain text....
JeeSs0930Author Commented:
I fixed my self,

This is what I did,

I added a SMTP connector on my exchange server to relay all my outbond email through my ISP.
In that case I change my recommendation to

PAQ: Refund

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