I've been bothered for a while that because my login on my machines is johnsu01, the envelope_from on my outgoing mail has been
email@example.com instead of the address I actually use (
firstname.lastname@example.org). This makes it impossible to unsubscribe from some mailing lists, since they look at envelope_from instead of From. I started trying to fix this in gnus, but then realized that it was easy in exim. Just open
/etc/email-addresses and add something like
Wait, did I just put my real email address on the internet? I MIGHT GET SPAM.