Message Composition

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Reply to Multiple Messages Requires Restart

Add menu commands for replying to multiple messages at the same time.

Rated 5 out of 5 stars (5)
529 users
Updated July 5, 2019

Send Later Requires Restart

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

Rated 5 out of 5 stars (139)
68,964 users
Updated Jan. 7, 2019

EnForward Requires Restart

Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).

This function can be invoked by "Forward to Evernote" in the context menu.

Rated 4 out of 5 stars (8)
1,571 users
Updated Jan. 6, 2019

SMTP Switch Reborn Requires Restart

SMTP Chooser.

Rated 5 out of 5 stars (2)
612 users
Updated Jan. 6, 2019

Resubmit Requires Restart

(Re)submit multiple messages to a predefined recipient(s)

Rated 5 out of 5 stars (2)
17 users
Updated Jan. 2, 2019

CloudFile Provider for DropBox

Uploads your large attachments to your DropBox instead of sending them by email

Not yet rated
0 users
Updated Dec. 31, 2018

BorderColors D Requires Restart

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 (4)
267 users
Updated Dec. 28, 2018

SmartTemplate4 Requires Restart

SmartTemplate4 offers an easy way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every account as well as for the default (all email accounts). Also supports the Stationery Add-on.

Rated 5 out of 5 stars (54)
18,696 users
Updated Dec. 26, 2018

Shrunked Image Resizer

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

Rated 3 out of 5 stars (38)
7,276 users
Updated Dec. 25, 2018

Auto Resize Image Requires Restart

Resizer for inline and attachment images (JPEG, PNG, BMP and GIF image formats).
All platforms are supported (Windows, Linux and Macintosh).

Rated 4 out of 5 stars (33)
15,936 users
Updated Dec. 24, 2018

ThunderHTMLedit Requires Restart

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 (10)
4,355 users
Updated Dec. 16, 2018

MEGAbird Requires Restart

Add MEGA support to Thunderbird's Filelink feature.

Rated 5 out of 5 stars (14)
2,652 users
Updated Dec. 12, 2018

CategoryManager Requires Restart

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 (9)
4,165 users
Updated Dec. 10, 2018

Emoji Requires Restart

Add emojis to your e-mails.

Rated 5 out of 5 stars (17)
10,850 users
Updated Dec. 3, 2018

Stationery Requires Restart

Extension to mimic Outlook Express Stationery.
Allow you to use HTML files as templates for mail. Also allow custom template in replies or forwarded mail!

Rated 4 out of 5 stars (120)
27,815 users
Updated Dec. 2, 2018

Grammar Checker Requires Restart

Checks grammar using LanguageTool.

Rated 3 out of 5 stars (8)
3,070 users
Updated Nov. 26, 2018

Highlighter Requires Restart

Quickly highlight some text in Thunderbird message composing windows.

Rated 4 out of 5 stars (61)
9,189 users
Updated Nov. 21, 2018

Reply As Original Recipient Requires Restart

Reply with the From: field set to the To: field from the original email.

Rated 4 out of 5 stars (5)
287 users
Updated Nov. 19, 2018

One-by-One Forward Requires Restart

Highlight multiple emails, right-click, then select "One-by-One Forward". This extension will allow you to forward the selected emails, one-by-one, to the recipients you specify using your choice of attachment handling.

Rated 2 out of 5 stars (2)
309 users
Updated Nov. 16, 2018

Don't Send Linked Files Requires Restart

Prevents sending of linked files if they are file: URLs.

Rated 1 out of 5 stars (1)
3 users
Updated Nov. 11, 2018