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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.

Rated 4 out of 5 stars (83)
3,320 users

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FlexConfirmMail Stable

Confirm mail address and attachments based on flexible rules.

This is enterprise edition with less updates. Another edition for regular users:
https://addons.thunderbird.net/thunderbird/addon/flex-confirm-mail/

Rated 4 out of 5 stars (11)
19,184 users

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kurl - YOURLS Shortener

Quickly shorten links with your self-hosted YOURLS instance. Provides a toolbar button, context menu, and keyboard shortcut for a fast workflow.

Not yet rated
3 users

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CloneMessage

When composing an email, CloneMessage allows you to duplicate the current state of the email.

Rated 5 out of 5 stars (1)
139 users

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Previous Colors

Quickly choose one of the previously selected colors for a message text

Rated 5 out of 5 stars (8)
1,673 users

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Mass Emailer

MassEmailer is a marketing email campaign manager for Thunderbird that helps you send bulk emails with rate limiting and features that include customizable templates, contact list management, campaign scheduling, all while respecting email servers.

Rated 5 out of 5 stars (5)
52 users

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Text Insert: Templates/Instant Spell Check

Email composer:
*Upper case the first letter of names or words at sentence start
*Insert styled text, images, tables with shortcuts
*Android(TM) like spellcheck/suggest alternatives (DE, EN, ES, FR,NL)

*Templates for XNote++, Nostalgy++, ES

Rated 3 out of 5 stars (8)
229 users

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Nostalgy++/ Manage, search and archive emails

Shortcuts to move/copy/archive messages, with folder name completion.
Rules for moving messages to folders.
Automatic rules by statistical observation/ by folder of conversation/thread.
Search dialog in a tab, with message display /folder tree.

Rated 5 out of 5 stars (80)
3,345 users

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AI Mate

Provides a compose button in Thunderbird that creates AI-powered email replies with OpenAI. Offers settings for API key, model choice, and customization options.

Not yet rated
56 users

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Advanced Composer

Creates message templates with variable support, quote header in Ms Outlook style, signatures, custom attachment info for cloud files, and more.

Rated 4 out of 5 stars (11)
473 users

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BorderColors D

Shows a colorful border around the "New Message" window, so you can tell different identities apart.

Builds on the original BorderColors and the "GT" version, adding different border styles.

Rated 4 out of 5 stars (36)
7,369 users

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FlexConfirmMail

Confirm mail address and attachments based on flexible rules.

This edition will have incompatible changes. Another edition for enterprise users with less changes:
https://addons.thunderbird.net/thunderbird/addon/flex-confirm-mail-stable/

Not yet rated
767 users

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Strikethrough Button

Adds a strikethrough toggle button to the Thunderbird compose toolbar. As this is an extension, it is not an integrated component of the Thunderbird toolbar. That is why it sits at the far right on the toolbar and not next to the B/I/U buttons.

Rated 3 out of 5 stars (2)
45 users

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