Message Composition

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MEGAbird Requires Restart

Add MEGA support to Thunderbird's Filelink feature.

Rated 5 out of 5 stars (5)
1,079 users

Single Domain Requires Restart

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 (1)
214 users

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
3 users

Edit Message Encoding Fallback Requires Restart

Fallback to a safe encoding, if you are replying to a message with unsupported encoding like UTF-16LE. (workaround for the Bug 961983)

Not yet rated
21 users

mms Auto Correct Requires Restart

AutoCorrect for the Compose window.

Rated 3 out of 5 stars (33)
668 users

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
637 users

Sensitivity Header + SPX Requires Restart

Implement the "Sensitivity" header for outgoing messages (described in RFC 4021 section 2.1.55).
Forked from another add-on developed by ff_bob, added SPX header for Sophos security appliances

Not yet rated
10 users

Copy Message ID Requires Restart

Adds a button to the message view toolbar to copy the message ID to the clipboard. This is useful when sending email replies via the command line.

Not yet rated
33 users

Insert Link from Local File Requires Restart

Inserts links from local files via drag and drop on the composition window.

Rated 3 out of 5 stars (3)
397 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 (3)
554 users

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.

Not yet rated
53 users

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 (17)
102 users

Smart Quotes Requires Restart

Enables “Smart” Quotes for Thunderbird Email

Rated 5 out of 5 stars (2)
72 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 (3)
27 users

Path Linker Requires Restart

メール本文中のファイルパスっぽいものをリンク化して関連付けで開けるようにします

Not yet rated
33 users

Reply to Multiple Messages

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

Rated 5 out of 5 stars (1)
96 users

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)
37 users

Tategaki Requires Restart

Tategaki allows vertical writing-mode on mail compose window.

Not yet rated
22 users

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)
92 users

X-Unsent support Requires Restart

Adds support for the X-Unsent header.

Rated 3 out of 5 stars (2)
185 users