Can anyone replicate this unusual error?

[Karl Wyant]

When sending out to multiple users, if a semicolon is used to 
separate the values instead of a comma,  yeah I know that only the 
Outlook Zombies would even consider doing such a thing, that IMP 
seems to send out a malformed warning message in which it attempts to 
send a warning to:

INVALID_ADDRESS@.SYNTAX-ERROR

Which of course generates an Invalid host name error message.

I'll send all of the details of my setup if that is required to debug 
this... but it is my guess that others will be able to easily 
replicate the error.

Thanks,
Karl