I was quite early with registering my Gmail account and I got a nice and clean firstname.lastname@example.org address. Apparently all mails end up on my account when people make simple mistakes in typing the intended e-mail address. So I receive several legitimate mails each month from people that did not intend to mail me; people that I don't know and have no desire to know.
If it where snail mail, I'd write Undeliverable or Wrong address over the envelope and put it back in the outgoing mail box. Now I'm looking for a way to do the same for e-mail.
How can I show the sender of an e-mail that the e-mail address is wrong without revealing my identity?
Any solution involving a Gmail feature, third-party application, or manipulation of the SMTP protocol is acceptable (I can program it if it doesn't exist already), as long as it works from Windows.
I used to reply along the lines of: You sent this e-mail to the wrong address. You sent it to email@example.com but you probably meant firstname.lastname@example.org. Kind regards, Marilyn Baker, revealing that my e-mail address is valid and who I was, and then they'd reply: Hey you have the same surname. You guys must surely be distantly related. Bla bla bla... John Baker is my husband, let's meet up... Bla bla. Anna Baker-Field
All names and e-mail addresses are fake.