Message Composition

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SmartTemplate4

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 (39)
15,182 users

SmilieInserter Plus

Insert smilies in messages.

Rated 5 out of 5 stars (16)
3,200 users

Address Widget Lines

Address Widget Lines provides the ability to select the number of address lines to display in the message compose window.

Rated 5 out of 5 stars (15)
674 users

Mail Merge Featured

Mass Mail and Personal Mail

Rated 5 out of 5 stars (110)
41,112 users

Send Later

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

Rated 4 out of 5 stars (46)
41,772 users

AVIM

An input method editor (IME) for Vietnamese. Type fully-accented Vietnamese directly into any Web page or dialog box using a standard keyboard.
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Bộ gõ tiếng Việt để nhập dấu trực tiếp vào bất kỳ trang Web và hộp thoại dùng bàn phím bình thường.

Rated 5 out of 5 stars (26)
4,651 users

Check and Send

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

Rated 4 out of 5 stars (18)
22,082 users

Smart Dictionary Switcher

Detects language while emails are being composed and automatically selects the best dictionary available.

Rated 5 out of 5 stars (12)
1,118 users

Stationery

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 (60)
38,178 users

Send and Archive

Adds a button to send an email and archive the original message.

Rated 5 out of 5 stars (5)
292 users

ThunderPEC

ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) in Thunderbird.

Rated 5 out of 5 stars (4)
6,249 users

Flexible Identity

Selects an identity based on the recipients list when sending an email

Rated 4 out of 5 stars (17)
1,754 users

Get before Send

Get messages for the account which is bound to the identity then send the message when you click the toolbar button or the menu item. If your SMTP sever authenticates using POP(IMAP) before SMTP, the extension is useful.

Rated 5 out of 5 stars (2)
1,579 users

Posting Style Enforcer

Automatically converts top-posted messages to use bottom-positng or vice versa. Interleaved posts are left alone. Detects automatically added text and supports a per-contact list of exceptions.

Rated 5 out of 5 stars (3)
38 users

EnForward

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 5 out of 5 stars (2)
1,258 users

DL for Thunderbird

Allows to convert large attachments to links automatically without 3rd party providers.

Rated 5 out of 5 stars (2)
284 users

random(signature)

Updates a given signature file in regular intervals.

Rated 4 out of 5 stars (35)
502 users

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 4 out of 5 stars (6)
1,330 users

hubiC for Filelink

Add hubiC support to Thunderbird's Filelink feature.

Rated 4 out of 5 stars (6)
701 users

BorderColors GT

How many time you sent an email from your wrong email address?
This add-ons allows you assign a different color to the compose window border for each of your email addresses. So you can immediately view from what account are you writing.

Rated 4 out of 5 stars (4)
3,191 users