Emu XL-7 & MP-7 User's Group

Sorry to bother everyone with this. When I sent a message to the 
list via e-mail earlier this morning, within minutes I received a 
message from a certain wireless mssaging provider saying that 
the message was undeliverable because the user account it 
was sent to did not exist.

Has anyone else been getting this? All I did was reply to a 
message I received from the list, and there was no one cc'd on it 
or anything. I kinda fear someone is "listening in" on my e-mail 
because of a virus or something. It seems unlikely because this 
is a new G4 and a pretty fresh OSX install. I'm not too concerned 
because I primarily only send mail to this list and the Oasys list, 
and the occasional rate quote for a project.

I'm thinking possibly this was a list member who cancelled the 
account he is subscribed with? I've never received a bounced 
message alert when I've sent to a list before. It's only happened 
with this list.

Thanks for your time.