Message Composition

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Send Later Requires Restart Featured

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

Rated 5 out of 5 stars (175)
75,874 users

Signature Switch Requires Restart Featured

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

Rated 4 out of 5 stars (215)
62,683 users

Mail Merge Requires Restart

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

Rated 5 out of 5 stars (180)
61,672 users

Owl for Exchange

Allows you to use your Exchange email accounts that use Outlook Web Access (OWA) with Thunderbird

Rated 4 out of 5 stars (41)
31,236 users

Check and Send Requires Restart

Check the message contents and addresses before you send the message...

Rated 4 out of 5 stars (31)
18,113 users

Emoji Requires Restart

Add emojis to your e-mails.

Rated 4 out of 5 stars (26)
16,180 users

Send Later Button Requires Restart Featured

A simple button to invoke the (already existing) send later functions.

Rated 4 out of 5 stars (6)
13,571 users

Flex Confirm Mail Requires Restart

Confirm mail address and attachments based on flexible rules.

Rated 4 out of 5 stars (8)
12,874 users

Grammar Checker Requires Restart Featured

Checks grammar using LanguageTool.

Rated 4 out of 5 stars (14)
11,162 users

ThunderHTMLedit Requires Restart Featured

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 (21)
10,640 users

FileLink Provider for Dropbox

Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.

Rated 4 out of 5 stars (6)
10,162 users

SmartTemplate4 Requires Restart

SmartTemplate⁴ 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 5 out of 5 stars (66)
10,063 users

Shrunked Image Resizer Requires Restart

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

Rated 3 out of 5 stars (52)
9,553 users

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 4 out of 5 stars (12)
6,275 users

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 (160)
6,167 users

Automatic Dictionary Requires Restart

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.

Rated 5 out of 5 stars (41)
6,044 users

ReplyWithHeader Requires Restart

Outlook style headers and few goodies for Thunderbird & Postbox.

Rated 5 out of 5 stars (35)
5,767 users

FileLink Provider for Box

Uploads your large attachments to your Box instead of sending them by email.

Rated 3 out of 5 stars (2)
5,588 users

Emoji Menu Requires Restart

Adds the ability to easily insert emojis into your composed messages in Thunderbird.

Rated 4 out of 5 stars (13)
4,317 users

Attach from Clipboard Requires Restart

Create file attachments directly from the system clipboard.

Rated 4 out of 5 stars (12)
3,616 users