Why am I getting email bounced back?

Episode 1395 (43:10)

Bob from Vista, CA

Bob keeps getting a bounce back notice when he sends an email to a friend, but the return address is from someone he doesn't know. Leo suspects that the autocomplete feature of Bob's email program is adding the address because it was from a previous email that included it. But the original email address may have added a filter to forward it to a friend and it's bouncing not only from Bob's friend, but also to Bob. In that case, there's nothing Bob can do but ask his friend to fix it.