I have a recurring error message in my postfix logs regarding a malformed address in the RCPT command. presumably because of the questionmark characters (which originaly was a single "é" character.
postfix/smtpd: warning: Illegal address syntax from localhost[127.0.0.1] in RCPT command: <firstname.lastname@example.org??.com>
This has been recurring every minute for several days. I've tried restarting postfix, but it pops up again.
I am somewhat of a postfix newbie, so I'm not sure what I need to do. How do I get rid of it? and/or, Is this a problem?