Message Composition

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Toggle Word Wrap Requires Restart

Toggle word wrapping and <PRE> element wrapping in the message composition and HTML display windows, respectively. Based on original version by Kaspar Brand.

Rated 5 out of 5 stars (6)
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Toggle Line Wrap

Toggle wrapping of long lines in the message composition window when writing plaintext messages. Wrapping can be controlled via a toolbar button and a keyboard shortcut.

Rated 5 out of 5 stars (5)
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EML-Editor

Addons to edit EML files and save your emails as EML file with their attachements.

Available on Github with MIT Licence :
https://github.com/pgpgeek/thunderbird-addon-eml-editor

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Custom Sender Address and Reply Requires Restart

Select sender mail address based on the recipient and reply with the same address

Rated 5 out of 5 stars (2)
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Toggle Address Box

Adds a Address Box button, toggles the Address Box in the Composer window

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Previous Colors

Quickly choose one of the previously selected colors for a message text

Rated 5 out of 5 stars (5)
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TarotSignature Requires Restart

This version provides a custom button for the message composer.
You need to customize your toolbar of the message composer.
The signature is hard-coded into the source code.
The signature is NOT being inserted automatically on window-open.

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Markdown Here Revival

A revival of the popular Markdown-Here addon for Thunderbird 78 and beyond.

Markdown Here Revival is a Thunderbird extension that lets you write emails in Markdown and render them as HTML before sending.

Rated 5 out of 5 stars (6)
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Expand mailing lists

Adds an 'expand lists' button to the compose window. It replaces all mailing lists with their contacts.

Rated 5 out of 5 stars (2)
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FileLink Provider for Dropbox

Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.

Rated 5 out of 5 stars (9)
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Add contact to CC by mentioning in body with @

Use @ to mention somebody on an email to link and add to the CC.

Rated 5 out of 5 stars (1)
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Limit non-BCC recipients

Check that number of non-BCC recipients does not exceed a parameter.

Rated 5 out of 5 stars (6)
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Owl for Exchange

Allows you to use your Exchange email accounts that use Outlook Web Access (OWA) with Thunderbird

Rated 5 out of 5 stars (89)
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Simple Mail Redirection

Allows you to resend (also known as redirect) email messages.
Uses 'cardbook' if installed

Bases on the add-on 'Mail Redirect' by Onno Ekker and Pawel Krzesniak

Please see the help page on how to use and why it sometimes does not work!

Rated 5 out of 5 stars (14)
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Mail Merge P

Mail Merge with Preview, an enhanced version of Mail Merge by Alexander Bergmann. MailMergeP Allows you to send bulk messages based on a spreadsheet of data.

Rated 2 out of 5 stars (3)
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FileLink Provider for Box

Uploads your large attachments to your Box instead of sending them by email.

Rated 4 out of 5 stars (4)
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To must occur only once

This add-on changes all but the first "to" to "cc" if there are multiple "to" when replying to an email.

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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.

Rated 4 out of 5 stars (4)
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Tulpe

Traffic light protocol extension for Thunderbird, messages are customizable in the option page.

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Transfer Immunity

Transfer Immunity is a fast and secure add-on and SaaS service for sharing and transferring files. This high-fidelity, SaaS-based platform allows users to send large files to different destinations as attachments with emails.

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