Message Composition

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Simple Mail Redirection

Allows you to resend (also known as redirect) email messages.
Uses 'cardbook' if installed

Bases on the add-on 'Mail Redirect' by Onno Ekker and Pawel Krzesniak

Please see the help page on how to use and why it sometimes does not work!

Rated 5 out of 5 stars (14)
4,672 users
Updated May 4, 2021

Send Later

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (226)
59,624 users
Updated April 30, 2021

ThunderHTMLedit

Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.

Rated 5 out of 5 stars (29)
16,567 users
Updated April 27, 2021

Flex Confirm Mail

Confirm mail address and attachments based on flexible rules.

Rated 4 out of 5 stars (10)
6,715 users
Updated April 19, 2021

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 (20)
4,919 users
Updated April 18, 2021

Autofile - fast e-mail to folder filing

Read an e-mail, hit Autofile button and it is filed / moved to the right mail folder based on the sender's address. No drag/drop needed.

Autofile can discover folders to store each author mail. Will save you lots of time like defunct filemail.

Rated 2 out of 5 stars (1)
62 users
Updated April 13, 2021

Add contact to CC by mentioning in body with @

Use @ to mention somebody on an email to link and add to the CC.

Rated 5 out of 5 stars (1)
119 users
Updated April 9, 2021

reply-all-auto-cc

When reply to all is used, move original To: recipients to Cc:
Also forces "Cc:" to be displayed on all new messages.

GitHub Repo: https://github.com/cyb3rmonk/reply-all-auto-cc

Rated 5 out of 5 stars (1)
41 users
Updated April 8, 2021

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).

Rated 5 out of 5 stars (15)
8,088 users
Updated March 23, 2021

New Email To All:reply, ready for new subject/body

Do you often send emails to the same list of people? Do you press reply and then clear off subject/email body?

No longer. Open a new compose window with all recipients/cc/bcc in a clean state. You can start with a new subject line and email body.

Rated 4 out of 5 stars (4)
102 users
Updated March 18, 2021

Signature Switch

Switch the signature on/off or choose a new one from your predefined set.

Rated 4 out of 5 stars (254)
38,148 users
Updated March 18, 2021

Mail Merge

Create and Save or Send Multiple Individual and Personalized Messages from a Draft

Rated 5 out of 5 stars (194)
65,901 users
Updated March 10, 2021

*cloud - FileLink for Nextcloud and ownCloud Featured

Upload large attachments to your Cloud and send the link by email

Rated 5 out of 5 stars (20)
12,880 users
Updated March 6, 2021

Text Insert/Text Blocks

Insert standard text blocks in an easy way in composer. No mouse: done by keyboard.

Type br<ctrl-d>, it converts to best regards. #c is cursor position.

Make a list of shortcut-replacements in the addon settings. Replacements may be multiline.

Not yet rated
44 users
Updated March 2, 2021

Markdown Here Revival

A revival of the popular Markdown-Here addon for Thunderbird 78 and beyond.

Markdown Here Revival is a Thunderbird extension that lets you write emails in Markdown and render them as HTML before sending.

Rated 5 out of 5 stars (4)
428 users
Updated March 1, 2021

Shrunked Image Resizer

Make your photos smaller, so they don't take forever to email.

Rated 3 out of 5 stars (73)
11,868 users
Updated March 1, 2021

SubSwitch

Simplify email categorization - it will be easier for you and others to manage mail. Define the set of prefixes for all emails you send or let SubSwitch to autodiscover it. While writing insert prefix to the title - choose one from your set.

Rated 3 out of 5 stars (10)
606 users
Updated Feb. 27, 2021

Transfer Immunity

Transfer Immunity is a fast and secure add-on and SaaS service for sharing and transferring files. This high-fidelity, SaaS-based platform allows users to send large files to different destinations as attachments with emails.

Not yet rated
66 users
Updated Feb. 23, 2021

Safe Links Cleaner

Clean up the display of links rewritten by Microsoft ATP Safe Links when reading and composing mail, so the original links can easily be viewed and copied, while retaining the rewritten addresses as the actual target of all links.

Rated 4 out of 5 stars (2)
41 users
Updated Feb. 20, 2021

StandardTexter

With the help of this Add-on, up to 99 pre-made texts (standard texts, text modules or even signatures) can be stored, which can then be retrieved and inserted when writing an e-mail.
The texts can be preformatted with HTML.

Rated 5 out of 5 stars (5)
610 users
Updated Feb. 16, 2021