MailFundus Archive
Email backup, search & cleanup
Only for Mac
Free · In‑App Purchases
Mac
Free up to 500 messages. All your emails safely archived on your Mac, searchable and cleared out of your mailbox.
Mailbox full, Mail getting sluggish, and you don't dare delete anything? MailFundus Archive backs up your Apple Mail mailboxes into an archive of their own on your Mac: verified byte for byte, searchable. Only when everything is provably backed up does the app clean up in Mail. Only verified messages, only after you confirm, only into Mail's Trash.
Download it free and try it: the free version backs up to 500 messages with every feature. The full version removes the limit, a one-time in-app purchase, no subscription.
THREE PROMISES
• Keep everything. Every message is stored, read back, and compared byte for byte with the original. Attachments, headers, formatting: nothing is lost, nothing is converted.
• Find it instantly. Full-text search across all archived messages and attachments, in milliseconds. By sender, subject, body, attachment name, and for PDF attachments by what is inside them. Every search under 60 ms, measured on 76,000 messages.
• Empty mailbox. Whatever is backed up and verified, MailFundus Archive moves to Mail's Trash after you confirm. You empty the Trash yourself, in Mail. Two steps, two deliberate decisions.
HOW IT WORKS
1. Select: Which mailboxes go into the archive? Count and size are shown next to each one. If you like, only messages older than a limit you set, such as 90 days or two years. Recent mail stays in Mail.
2. Back up and verify: Archive, compare byte for byte, restore a random sample. Mail is not touched.
3. Delete from Mail: MailFundus Archive lists the mailboxes that are backed up and verified. You confirm. The app moves exactly those messages to Mail's Trash and verifies each one against the archive once more right before moving it. Anything not verified byte for byte stays in Mail. You empty the Trash yourself in Mail; afterward the app records what is really gone.
4. Find it again: Search, read, open attachments. To bring a message back to Mail, use "Restore to Mail" as .mbox or .eml.
STRAIGHT TALK
• MailFundus Archive deletes only what is verified, and only after you confirm. Into Mail's Trash, never permanently. You empty the Trash yourself.
• It only reads the folder where Mail keeps your messages. For that it needs two permissions: access to that folder, granted in the open dialog, and Automation permission to control Mail. macOS asks you for both, and the app explains both when they come up. You can change the Automation permission at any time in System Settings under Privacy & Security; the folder access ends when you remove the app.
• If you would rather delete in Mail yourself, you still can: "Delete in Mail Yourself…" shows you what is safe to delete, and MailFundus Archive checks afterward what is really gone.
• No lock-in: Any message can be exported as .eml or .mbox at any time. The archive is a single file on your disk, and Time Machine backs it up along with everything else.
WHAT'S INSIDE
• Byte-for-byte backup with checksums and a verification log for every run
• Deduplication across all mailboxes: the same message is stored only once
• Compact storage: In testing, 19 GB of Mail became an 8.6 GB archive, complete byte for byte
• Safe stop: A run can be stopped at any time without losing anything
• Deleting is optional: If you only want to back up, turn that step off in Settings
• Light, dark, or match the system; works with VoiceOver
FREE VERSION AND FULL VERSION
• Free: back up, verify, search and delete from Mail up to 500 messages, every feature included.
• Full version: any number of messages, a one-time in-app purchase, no subscription. Works on all your Macs with the same Apple Account.
• Always free: Whatever is in the archive stays readable, searchable, exportable and restorable to Mail, with or without a purchase.
REQUIREMENTS
macOS 15 or later, Apple Mail with locally stored messages. No account, no sign-in, no data collection. Everything stays on your Mac.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Faster browsing, images, and a fix for interrupted runs — thank you for the feedback.
• Clicking a mailbox, an account or a year is many times faster with large archives: the list first fetches the mailbox's messages through a dedicated index and sorts them, instead of scanning the whole archive.
• Embedded images — logos in signatures, photos inside the message — are now shown; they were always in the archive. Images from the web are still not loaded automatically (the sender would learn when you read); new is a bar above the message with “Load” for this message and “Always load” as a setting.
• If a backup run was interrupted hard (app quit, Mac crashed), messages could remain in the archive whose attachments were never written — unreadable, and no later run picked them up. A message now enters the catalog only once everything it refers to is on disk.
• Existing archives heal themselves: such messages are detected, removed from the catalog and re-archived from Mail on the next backup. The step is recorded in the verification logs.
The developer, Coolblack GmbH, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Coolblack GmbH
- Size
- 3.8 MB
- Category
- Productivity
- Compatibility
Requires macOS 15.0 or later.
- Mac
Requires macOS 15.0 or later.
- Mac
- Languages
- English and German
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Full Version $24.99
- Copyright
- © 2026 Coolblack GmbH
