Trouble with Squirrelmail

[sammy!!!]

I am getting the following error when trying to send mail with  
Squirrelmail:
Error: Band or malformed request.
Server Responded: Missing literal in APPEND

Which is the same listed here, another user of a FreeBSD system, with  
not a lot of other information:
http://sourceforge.net/mailarchive/forum.php? 
thread_id=9297556&forum_id=2995

Anyone else run across this error and have a possible solution?  Any  
help, on the list or off, would be greatly appreciated since users  
are really starting to get nervous.