'Edit as new message': It would seem as if the original received email 'From' field is checked to see if a mail identity has been created in Thunderbird. Obviously, in most instances, this is not the case, so you get the yellow banner which serves no purpose, but it is irritating and looks like a warning as if something is really wrong. BUT....If you are wanting to 'Edit as a new Message' , then you would expect the 'From' to use your own mail account email address and not the 'From' of the original email. You would also expect all other fields eg: TO, Cc to be blank because it is editing as a NEW message. Those other fields eg: TO, Cc, Bcc are also completed which is wrong. The original email was sent TO me, so you would not expect the NEW message to enter ME in a TO field. The 'Edit as new message' option is not operating as you would expect.
Bug 1762192 Comment 1 Edit History
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'Edit as new message': It would seem as if the original received email 'From' field is checked to see if a mail identity has been created in Thunderbird. Obviously, in most instances, this is not the case, so you get the yellow banner which serves no purpose, but it is irritating and looks like a warning as if something is really wrong. BUT....If you are wanting to 'Edit as a new Message' , then you would expect the 'From' to use your own mail account email address and not the 'From' of the original email. You would also expect all other fields eg: TO, Cc to be blank because it is editing as a NEW message. Those other fields eg: TO, Cc, Bcc are also completed which is wrong. The original email was sent TO me, so you would not expect the NEW message to enter ME in a TO field. The 'Edit as new message' option is not operating as you would expect. You have to delete everything in all the TO, Cc Bcc fields. You have to ignore what looks like a warning in a yellow banner. Neither of the above should be occuring.