Possible ucb mail bug? (address mangled)

[Doug Mildram]

I am seeing this behavior with /usr/ucb/mail, when the recipient is:
  To: user                     and the sender is:
  From: another at host.dom

When user hits "r", he sees To: host.another at dom (truly mangled)

To avoid this for now I config (set up sendmail.cf) to change 
RCPT ruleset so that it's To: user at host or user at host.mydom.com

I've seen the code in optim.c where netmap(name,from) 
   does a quick return() if it finds the @ or % in "name"
   so I know I'm close to the offensive code...

Is this a bug, a known bug, is there a patch ?  many thanks...
Please reply via mail....thanks a bunch!

dmildram at encore.com Encore Computer Corp, Marlboro, Mass 508-460-0500