A new Thunderbird address book based on the CardDAV and vCard standards.
Correct Identity lets you better configure the default identity to be used when composing messages. When replying it can enumerate all your identities, thus not only those that belong to the account, trying to find the one that actually matches the addr.
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Display birthdays from the Thunderbird addressbooks as events in Lightning.
The mailredirect extension for Mozilla Thunderbird (version 0.7 and above) and Mozilla Mail client adds ability to redirect one or more mails to one or more recipients. Feature of mail redirecting is also known as bouncing.