Thunderbird: Add self corrections to email addresses when reply emails are sent

[onix]

Allow setting an overriding default to outgoing replies by preferably formatting all email headers to "Firstname Lastname <username@somewhere.com>", or to "Display Name <username@somewhere.com>", where Display Name is set in the Address Book, i.e. just above the option to select "Prefer display name over message header"

[Jon]

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