PostScriptum

No More Mail Muddle

The Thunderbird add-on that files your sent message and the replied-to or forwarded original — across accounts and servers, into the folders you choose, with tags.

Get it free for Thunderbird

Free Open source · MIT license Supported from Thunderbird 140+ No tracking

Everything in one place

Sound familiar? The reply is buried somewhere in your Sent folder, the request in an entirely different project folder — you search and sink into tab chaos. With PostScriptum that’s a thing of the past: whatever you forward or reply to stays in the same place as the original. Exactly where you want it.

File across accounts and servers

Move mail from one IMAP server or account to another. The destination is yours to choose.

All in one place

Whether forwarded or replied-to: what belongs together stays together.

PostScriptum

Only right after sending do you still reliably know what goes where. Later, you forget. That makes it the right moment to decide on filing.

Learns as you file

PostScriptum gets smarter with every filing. It spots your patterns and suggests where things usually go — one press of Enter and it’s done.

Preview at a glance

Want to know what last happened in a project? PostScriptum shows you the most recent filings before you add the new one.

Shortcuts

File into your favourite folders even faster — no mouse, freely configurable, with handy suggestions from the built-in statistics.

Thunderbird tags

Use your Thunderbird tags across devices — and, if you like, separately for the reply and the message you replied to.

Exchange / Office 365 cleanup

Tired of the endless duplicates on Microsoft accounts? PostScriptum tidies up for you and reliably keeps only the original message.

You're the boss

You decide, PostScriptum executes — from account order to the many filing options in each individual case.

See it in action

Filing dialog: smart suggestion, recent activity, shortcuts, and tags.

Learns as you file and previews the latest activity in the project.

Configuration: language, account order, and custom shortcuts.

Configuration: statistics, smart filing detection, and Exchange cleanup.

Privacy by design

PostScriptum collects, stores and transmits no personal data whatsoever. Everything runs entirely locally on your device in Thunderbird. No external servers, no tracking, no analytics, no third parties. PostScriptum uses your messages for one purpose only: filing them perfectly and carrying out your instructions.

The developer world needs more caffeine

Because generosity today is even rarer than a LinkedIn post that does not open with “humbled, thrilled and honoured” and somehow ends on a piece of grandmotherly wisdom, such generosity is especially appreciated.

That aside, PostScriptum is and always will be free. Promised.