Message Composition

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SMTP Switch Reborn Requires Restart

SMTP Chooser.

Rated 5 out of 5 stars (2)
612 users

Reply To All Reminder Requires Restart

Asks for confirmation when "Reply" instead of "Reply to All" is pressed on an email with multiple recipients.

Rated 5 out of 5 stars (2)
242 users

Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 4 out of 5 stars (16)
3,543 users

ThunderPEC Requires Restart

ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.

Rated 5 out of 5 stars (11)
23,654 users

BorderColors GT Requires Restart

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 (10)
1,072 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 (120)
27,815 users

ReplyWithHeader Requires Restart

Outlook style headers and few goodies for Thunderbird & Postbox.

Rated 4 out of 5 stars (17)
3,034 users

PennyPost Requires Restart

This extension makes it very easy to generate and attach stamps to outgoing mail. It also automatically detects and verifies stamps on incoming emails. The MBound algorithm requires a 16MB fixed table to work, HashCash is more CPU intense.

Rated 5 out of 5 stars (4)
5 users

Check and Send Requires Restart

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

Rated 4 out of 5 stars (31)
16,190 users

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

Emoji Menu Requires Restart

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

Rated 4 out of 5 stars (9)
1,115 users

hubiC for Filelink Requires Restart

Add hubiC support to Thunderbird's Filelink feature.

Rated 4 out of 5 stars (14)
314 users

replyTo Requires Restart

Adds a menuitem to the Mail context Menu to Reply to a different Mailadress

Rated 4 out of 5 stars (10)
35 users

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

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

Colored Recipient Type Requires Restart

Customize background-color of the recipient address fields for each recipient types of To:, Cc:, Bcc:.Customize background-color of the recipient address fields for each recipient types of To:, Cc:, Bcc:.

Rated 4 out of 5 stars (4)
258 users

Highlighter Requires Restart

Quickly highlight some text in Thunderbird message composing windows.

Rated 4 out of 5 stars (61)
9,189 users

Flexible Identity Requires Restart

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

Rated 4 out of 5 stars (30)
1,102 users

random(signature) Requires Restart

Updates a given signature file in regular intervals.

Rated 4 out of 5 stars (44)
64 users

Reply to All as Cc Requires Restart

Send a reply for recipients as CC except the sender, when you do "Reply to All".

Rated 4 out of 5 stars (9)
192 users