How do I add-on a second email address?

I received an email with my email address as the sender. How can they send an email to me ...from me?

• I received an email that was sent from my email address. There were two emails in succession. They were sent to me. It was an offer and of course, there is no clue as to who sent ...show more

• Answer:

  it's because the person you sent the email to did not know how to properly answer, or has somebody answer all of their emails. lets say your email address is [email protected] you send an email to [email protected] well, [email protected] didnt know how to respond or forwarded the message to another source for answering. so now [email protected]'s friend/associate is answering your email. after they send their response to you, it comes back saying the email was from you. actually, idk wtf im talking about. sorry.