Add-ons
Message Composition
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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.
Copy Message ID
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.
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)
New Email To All:reply, ready for new subject/body
Do you often send emails to the same list of people? Do you press reply and then clear off subject/email body?
No longer. Open a new compose window with all recipients/cc/bcc in a clean state. You can start with a new subject line and email body.
Attach from Clipboard
Create file attachments directly from the system clipboard.
Reply As Original Recipient
Requires Restart
Reply with the From: field set to the To: field from the original email.
Reply To All Reminder
Requires Restart
Asks for confirmation when "Reply" instead of "Reply to All" is pressed on an email with multiple recipients.
SMTP Switch Reborn
MultiTemplateLoader
Requires Restart
THIS ADD-ON IS OFFICIALLY ABANDONED
(there will be no more updates, I can't keep up with the changes in Thunderbird).
Manages & applies multiple HTML templates when creating/replying messages.
Identity Checker
Requires Restart
This add-on checks to sender identity when send a message.
ConferenceCall.co.uk templates
This plugin adds our savvy email templates to your Thunderbird toolbar.
Telefonkonferenz.de-Vorlagen
Durch das Plug-in werden unsere praktischen E-Mail-Vorlagen Ihrer Thunderbird-Symbolleiste hinzugefügt
ConferenceCall.nl templates
Voegt de handige e-mail templates toe aan de knoppenbalk van Thunderbird om deelnemers aan uw conference call uit te nodigen.
Emoji
Tategaki
Requires Restart
Tategaki allows vertical writing-mode on mail compose window.
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:.
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
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.
Check Attachment before Send
Requires Restart
Confirms to send a mail with any attachment.
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..
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