FIX: Parse address lists in embedded emails (PR #14514)

Same fix is applied to emails immediately after being parsed because long headers are sometimes in an invalid format.


If that methods is changing mail, it should end with a ! to indicate it has side effects

Might also be worth putting the method (and potentially others?) in a helper class rather than leaving it in Email:Receiver

Didn’t you add the ! at the end of the method’s name?

Shouldn’t this be mail instead of @mail?

I don’t know how I managed to stage only some changes. :sweat_smile: