Message Composition

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Single Domain

Warns if you send mail from or to a specified domain. If there are multiple accounts in your profile, you can isolate one so that you can't send mail to that domain from outside or vis versa without warning.

Rated 5 out of 5 stars (3)
24 weekly downloads

Don't Send Linked Files Requires Restart

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

Rated 1 out of 5 stars (1)
24 weekly downloads

Identity Checker Requires Restart

This add-on checks to sender identity when send a message.

Not yet rated
24 weekly downloads

random(signature) Requires Restart

Updates a given signature file in regular intervals.

Rated 4 out of 5 stars (50)
24 weekly downloads

Rage Hoye Requires Restart

Prevents you from sending offensive mails based on a keyword list

Not yet rated
24 weekly downloads

Attachemnt Encoding Detector Requires Restart

To detect file encoding of attachments, this forces to Thunderbird to use an encoding detector for a specific locale instead of the generic one.

Not yet rated
24 weekly downloads

BccBlocker Requires Restart

A ThunderBird extension to prevent the use of the Bcc field.

Bcc is the worst thing ever.
It kills transparency inside an organization.
If you use the Bcc feature, you should ask yourself why..

Not yet rated
24 weekly downloads

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)
23 weekly downloads

RM: EXTERNAL: Requires Restart

Removes 'EXTERNAL: ' from the start of an email subject if it is preceded by 'RE:' or 'FWD:' (case insensitive). The removal is done after the 'Send' button is pressed.

Not yet rated
23 weekly downloads

FastCC Requires Restart

A Thunderbird extension that let you switch to cc: with the ALT+CTRL+C keyboard shortcut!

Rated 5 out of 5 stars (1)
23 weekly downloads

SendToSecondEmail Requires Restart

This Extension lets you send Mails to both, first and second email address...

Rated 4 out of 5 stars (2)
23 weekly downloads

Posting Style Enforcer Requires Restart

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)
23 weekly downloads

ThunderBird Ticker Requires Restart

Extension for creating support tickets based on mail.

Not yet rated
23 weekly downloads

Patch to Alert Invalid Addresses Requires Restart

Shows alert if there is any invalid address in sending message.

Rated 1 out of 5 stars (1)
22 weekly downloads

~okeanos for Filelink Requires Restart

Add ~okeanos support to Thunderbird's Filelink feature.

Rated 1 out of 5 stars (1)
22 weekly downloads

Synnefo for Filelink Requires Restart

Add Synnefo support to Thunderbird's Filelink feature.

Not yet rated
22 weekly downloads

Smart Quotes Requires Restart

Enables “Smart” Quotes for Thunderbird Email

Rated 4 out of 5 stars (3)
21 weekly downloads

HtmlHighlightr Requires Restart

Provides source code highlighting in editor's "Insert HTML" dialog.

Rated 5 out of 5 stars (1)
21 weekly downloads

nomapi Requires Restart

not a mapi plugin

Not yet rated
21 weekly downloads

RemindIt

Help in reminding mails to be answer or sent again. Choose a reminder date for each received or send message that are highlighted in the message list, depending on their status (expired, soon to exprire, to be reminded). Sending a reminder is eased.

Rated 3 out of 5 stars (26)
21 weekly downloads