Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)
Check that number of non-BCC recipients does not exceed a parameter.
Quickly choose one of the previously selected colors for a message text
Upload large attachments to your Cloud and send the link by email
Address bulk copy （アドレス一括コピー） Requires Restart
Thunderbird は Outlook のようにアドレス全選択からの「一括コピー」ができません。
Macro Template is to replace mail templates with macros for date formatting.
Stop Ignoring Reply:To Requires Restart
Default "Reply" functionality pays attention to "Reply-To" in original email
Modern, nice emoji picker that you can use to find and select emojis. It will be copied to your clipboard or even directly inserted into the e-mail, when you click on it.
You will certainly like it.
Edit emails in external editors such as Vim, Neovim, Emacs, etc.
With the help of this Add-on, up to 99 pre-made texts (standard texts, text modules or even signatures) can be stored, which can then be retrieved and inserted when writing an e-mail.
The texts can be preformatted with HTML.
Create and Save or Send Multiple Individual and Personalized Messages from a Draft
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.
Adds support for the X-Unsent header.
True "Send Later" functionality to schedule the time for sending an email.
As-you-type phonetic conversion of text from one alphabet to another, as well as transliteration/detransliteration of selected text anywhere within documents. Supports multiple languages and custom transliteration schemes.
It permits just with a single click to copy an emoji.
There is a search-box and the "Most used emojis" section (the first one).
If you want to send feedback or report bug, please go to https://github.com/Sav22999/emoji
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).
Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).
Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
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.