When I forward an email to my contacts group, I get an undeliverable reply for an address that I didn't know I was forwarding it to. It is an address that is not known to me and not visible in the address bar. How can I find out where it is coming from and how to stop it?

  • Based on the keywords, I assume this is about Gmail. Please be more specific in the future.
    – user79865
    Jul 23, 2015 at 22:47
  • I wonder if one of your addressees has set up a forward. I don't know if this might give you an undeliverable response. Jul 25, 2015 at 5:07

1 Answer 1


Short answer

Analyze the email headers


From [1]

Email headers determine where a message is sent, and records the specific path the message follows as it passes through each mail server.

Go to [1] to learn more about the how to read email message headers.

Go to [2] for instructions on finding headers for a message.


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