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Mail Merge
Create and Save or Send Multiple Individual and Personalized Messages from a Draft
Signature Switch
Switch the signature on/off or choose a new one from your predefined set.
SmartTemplates Featured
SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.
Automatic Dictionary
Remembers the language you use with a person or group of people, and switches the spellchecker language automatically for you next time. You do not have to do it manually any more. It remembers and switches it for you.
FlexConfirmMail
Confirm mail address and attachments based on flexible rules.
(This project was renamed from "Flex Confirm Mail" to "FlexConfirmMail", due to a branding reason.)
CategoryManager
Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
Identity Chooser
Identity Chooser helps you to always use the correct identity when composing a new email.
ReFwdFormatter
Remove the ">" prefix from quote when you make a reply.
[Source code] https://github.com/isshiki/ReFwdFormatter
Copy Message ID
Adds a button to the message view toolbar to copy the message ID to the clipboard. This is useful when sending email replies via the command line.
Macro Template
Macro Template is to replace mail templates with macros for date formatting.
Single Domain
Warns if you send mail from or to a specified domain. If there are multiple accounts in your profile, you can isolate one so that you can't send mail to that domain from outside or vis versa without warning.
RemindIt
Help in reminding mails to be answer or sent again. Choose a reminder date for each received or send message that are highlighted in the message list, depending on their status (expired, soon to exprire, to be reminded). Sending a reminder is eased.
Markdown Here Revival
A revival of the popular Markdown-Here addon for Thunderbird 115 and beyond.
Markdown Here Revival is a Thunderbird extension that lets you write emails in Markdown and render them as HTML before sending.
To create your own collections, you must have a Mozilla Add-ons account.