When the user performs a Reply or Reply to All, the TO field is populated with only their email address, not the senders. They’ve been a notes user for quite some time. This just started last week. No changes had been made, that I’m aware of.
Subject: To field defaults to my email address when replying to an email.
Does this Mail Originate from any Notes Application. If thats the case the check out the SMTPOriginator,principle fields.