Wrong report attached or wrong printer in the subject line?
Have you tried simply giving the rule a from address to send from or no?
If the reply to address is already there it would have to mean you did not give the printer a from address in the email setup, which of course must be done to send an email.
Which is done in CWIS > Properties > Connectivity > Setup > SMTP > Edit
as well as CWIS ? Properties > Services > Email > Setup > From Field > Edit
All 3 locations must be identical for obvious reasons (You can't log into your gmail account and send an email from my account, printer can't do that either)