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Reply As Original Recipient Requires Restart
Reply with the From: field set to the To: field from the original email.
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:.
IMAP Draft Unread Requires Restart
This is a Thunderbird addon that lets you customize the behavior of the IMAP draft unread messages. No more new mail notifications for your drafts!!
Insert Link from Local File Requires Restart
Inserts links from local files via drag and drop on the composition window.
Highlight External Addresses Requires Restart
This extension helps to warn the user when composing a message to a mixed group of people both in and out of the sender's organization. External addresses are highlighted in orange as a reminder.
Flexible Identity Requires Restart
Selects an identity based on the recipients list when sending an email
replyTo Requires Restart
Adds a menuitem to the Mail context Menu to Reply to a different Mailadress
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..
Identity Checker Requires Restart
This add-on checks to sender identity when send a message.
Reply To All Reminder Requires Restart
Asks for confirmation when "Reply" instead of "Reply to All" is pressed on an email with multiple recipients.
Don't Send Linked Files Requires Restart
Prevents sending of linked files if they are file: URLs.
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.
SendToSecondEmail Requires Restart
This Extension lets you send Mails to both, first and second email address...
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.
FastCC Requires Restart
A Thunderbird extension that let you switch to cc: with the ALT+CTRL+C keyboard shortcut!
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.
Synnefo for Filelink Requires Restart
Add Synnefo support to Thunderbird's Filelink feature.
To create your own collections, you must have a Mozilla Add-ons account.