Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).
True "Send Later" functionality to schedule the time for sending an email.
Create and Save or Send Multiple Individual and Personalized Messages from a Draft
Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
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.
Confirm mail address and attachments based on flexible rules.
Estimez votre CO₂ quand vous rédigez un mail en un simple clic ! Pendant la rédaction de votre mail, cliquez sur l'extension afin de connaître l'émission de CO₂e générée par l'envoi du mail. Vous saurez aussi à combien de kilomètres cela correspond.
Switch the signature on/off or choose a new one from your predefined set.
Allows you to use your Exchange email accounts that use Outlook Web Access (OWA) with Thunderbird
SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.
Upload large attachments to your Cloud and send the link by email
Updates the local OpenPGP Alias file from a server to simplify encryption for mailing lists, or email aliases in an organizational environment.
Please make sure config parameter "mail.openpgp.alias_rules_file" is set to "openpgp_alias.json".
Adds a Address Box button, toggles the Address Box in the Composer window
Traffic light protocol extension for Thunderbird, messages are customizable in the option page.
Check that number of non-BCC recipients does not exceed a parameter.
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!
Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.
Shows a colorful border around the "New Message" window, so you can tell different identities apart.
Builds on the original BorderColors and the "GT" version, adding different border styles.
Read an e-mail, hit Autofile button and it is filed / moved to the right mail folder based on the sender's address. No drag/drop needed.
Autofile can discover folders to store each author mail. Will save you lots of time like defunct filemail.
Use @ to mention somebody on an email to link and add to the CC.