I used Thunderbird to move e-mails from one account into my Gmail account, but somehow some of the e-mails' From headers have disappeared. I would like to edit the e-mails to add these headers again.
1 Answer
That's not going to be possible from within Gmail.
The only way I can think to do it is to use a third-party email client (like Thunderbird) to export the messages to text files, edit them, then re-import them back into the email client, then add them to the Gmail account.