Mutt and debian-user list

[Vladimir Zolotykh <gsmith@eurocom.od.ua>]

Why Mutt wouldn't send messages to debian-user@lists.debian.org, do you 
know?
I can send it with Mozilla Thunderbird, but can't using Mutt.
What might be wrong with my using Mutt?
I can send and receive personal mail with Mutt.
If you know what might be the cause for that please let me know, I'd 
appreciate any clue.

--
Vladimir Zolotykh