Do you think a bad email address on one box might effect other boxes with a good address?

Like say it tries to send a message to a bad email then later tries to send to a good email could they all hang in the ready folder?

I could see this happening if an application was running that tried to send out all of the messages in the ready folder and then hitting a bad email address and hanging or just keeps bouncing the bad email off the email server over and over again.

Very interesting ........