We find that spammers use this ploy to disguise where their millions of spam emails are generated from.
Why do you want to do that?
I am trying to make my gmail address appear as another address and have set the settings to make that happen, but when someone receives an email from it shows my emails from "email@example.com on behalf of person@domainname". Has anyone else had this problem and what did you do to correct it?
Thanks for any help you can provide.