I am trying to send out an email to people in my distrabution list. There are around 100 people on the list (I don't know if that matters). When I set up the email I put myself in the "to" line and the distrabution list in the "bcc". When I hit send the email comes to me fine but I also get one from "System Administrator" saying

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

Subject:
Sent: 11/4/2009 1:21 PM

The following recipient(s) could not be reached:

'XXXXX' on 11/4/2009 1:21 PM
501 Syntax error in arguments

I can't figure why it won't send. I have tried making a new list but it does it with that one to. I have confirmed the emails with my master list. It has worked before I don't know what has happened. Thanks for any help