Add-ons
Message Composition
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SmartTemplates
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.
3,691 users -
*cloud - FileLink for Nextcloud and ownCloud
Upload large attachments to your Cloud and send the link by email
39,312 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.117,367 users -
Check your emails for spelling and grammar issues75,796 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft74,486 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).52,501 users -
Switch the signature on/off or choose a new one from your predefined set.52,426 users -
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.49,876 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text1,879 users -
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。
それを実現するためのアドオンです。450 users -
Macro Template is to replace mail templates with macros for date formatting.569 users
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Default "Reply" functionality pays attention to "Reply-To" in original email62 users
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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.96 users
Recently Added See all »
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Claify est une extension Thunderbird qui intègre l'intelligence artificielle Claude (Anthropic) directement dans votre client email. Résumez, traduisez, corrigez et rédigez vos emails en un clic.
Fait avec ❤️ par Supersonique Studio0 users -
Highly-customizable and performant extension for @-mentions inside Thunderbird.5 users -
GPT/Gemini/Claude対応。返信画面でワンクリック or ショートカットキーでAI返信を自動生成。トーン選択可能（前向き・お断り・カスタム）7 users -
Check your email with Gemini AI before sending.
A Thunderbird add-on that uses Google's Gemini AI to review your emails before sending. Get intelligent feedback on spelling, grammar, tone, clarity, and potential issues.32 users -
Automatically set From address to match email aliases when replying, with optional alias suggestion and identity creation3 users
See all 266 extensions in Message Composition »
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