BSD Local IMAP-POP Sync

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BSD Local IMAP-POP Sync helps Thunderbird users keep selected folders from an IMAP account synchronized with local folders belonging to a POP3 account.

It is designed for users who prefer POP3 for local mail storage but also use IMAP to share Sent messages and other selected folders across devices.

MAIN FEATURES

• Sent synchronization: Automatically copy new messages from an IMAP Sent folder into the corresponding local POP3 Sent folder.

• Spam/Junk synchronization: Copy new messages from an IMAP Junk/Spam folder into the local POP3 Junk folder.

• Additional folder mappings: Configure optional one-way synchronization between other IMAP folders and local POP3 folders.

• Outgoing Sent-copy routing: Optionally save messages sent using a POP3 identity to the selected IMAP Sent folder, allowing other devices to see those sent messages.

• Duplicate prevention: Track processed messages locally and check destination folders to avoid repeated imports.

• Safe first-run behavior: Skip existing messages when first enabling synchronization, so historical mail is not intentionally imported.

• Multiple account pairs: Configure separate synchronization rules for different IMAP and POP3 accounts.

• Automatic and manual scans: Synchronize on a schedule, in response to new-mail events, or by clicking Scan now.

HOW IT WORKS

Configure an IMAP source account and a POP3 destination account in Thunderbird. Select the folders you want to synchronize and enable the corresponding rule.

BSD copies eligible messages from selected IMAP folders into local POP3 folders. Message tracking and configuration are stored in the local Thunderbird profile.

Synchronization is one-way. BSD does not mirror deletions, synchronize message edits, or modify IMAP messages with tracking flags.

PRIVACY

BSD does not use developer-operated analytics or a message-collection service. Synchronization uses the accounts you configure in Thunderbird.

Settings and duplicate-tracking information remain in your Thunderbird profile. Tracking records may contain message metadata, including message identifiers, email addresses and subjects. See the add-on's privacy policy for details.

COMPATIBILITY

• Requires Thunderbird 128 or later according to the extension manifest.
• Functionally tested with Thunderbird 158 on Windows.
• Thunderbird 128 and other operating systems have not been independently tested.

LICENSE AND SUPPORT

License: GNU General Public License v3.0 (GPL-3.0-only)
Publisher: 77Soft
Author: Aleksandar Anastasovski
Support: alek@77soft.mk

Informacje o wersji

Wersja 3.3.3 Wydany dnia Lis. 7, 2026 42.0 KiB Działa z Thunderbird 128.0 i późniejsze

BSD Local IMAP-POP Sync v3.3.3

Maintenance and review-compliance release.

- Reformatted options.js and popup.js into readable, unminified JavaScript.
- Replaced deprecated innerHTML usage with safe DOM operations.
- Improved source-code readability and compatibility with Thunderbird add-on review requirements.
- Preserved existing POP3/IMAP synchronization functionality, folder mapping, and duplicate prevention.
- No new permissions or synchronization features.

Successfully validated with Thunderbird's WebExtension Linter and tested for Sent/Junk synchronization, duplicate prevention, and configuration persistence.

Kod źródłowy wydany na licencji General Public Licence, wersja 3.0

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Privacy Notice — BSD Local IMAP-POP Sync
Publisher: 77Soft
Contact: alek@77soft.mk
Applies to: desktop Thunderbird extension BSD Local IMAP-POP Sync, version 3.3.2
Last updated: 15 October 2026
What the extension does
BSD Local IMAP-POP Sync copies messages from folders of IMAP accounts you select into local folders of POP3 accounts already configured in Thunderbird. You decide which accounts, folders and rules to enable. It can also, if you explicitly enable the option, direct outgoing Sent copies from a POP identity to a selected IMAP Sent folder. The extension does not delete or move IMAP source messages, mirror deletions, or write IMAP tracking flags.
Data accessed and why
To operate, the extension accesses Thunderbird account identities and account/folder names and identifiers. It reads message information from selected folders, which may include Message-ID, date, sender, recipients, subject, message size, and read/flagged status. It reads the raw contents and attachments of messages it is copying, and may search destination folders by Message-ID to avoid importing duplicates. This access is for the user-selected copying and duplicate-prevention functions.
Data stored on your computer
Within your local Thunderbird profile, the extension stores your configured rules, selected account/folder information, counters, status and timestamps, up to 15 recent scan events, and processed-message fingerprints in local extension storage/IndexedDB. A fingerprint normally includes a Message-ID; if a message lacks one, a fallback fingerprint can include message date, size, sender, recipients and subject. Error details may include a message subject or other diagnostic text. Fingerprints are metadata used to avoid duplicate copying, not full stored message bodies. Copied messages and attachments themselves are placed in the destination Thunderbird mail folder.
Old processed-message fingerprints are cleaned up according to the configured local tracking retention period (default 365 days, subject to scheduled cleanup). Configuration, rule counters and other status records do not necessarily use that retention period. Thunderbird profile backups can retain past copies. The extension does not promise that uninstalling it automatically erases all profile storage or backups.
Network transmission and sharing
The extension does not include its own analytics, telemetry, advertising, developer-operated mailbox service or external collection endpoint, and it does not send mailbox contents, tracking records or logs to 77Soft. It uses Thunderbird's own mail APIs and your configured mail-provider connections. When you enable outgoing IMAP Sent-copy routing, the Sent message (including any attachments) is saved to the IMAP server you selected, so the message may become accessible to your other mail clients. Normal email-server and Thunderbird service data handling remains governed by the relevant providers' policies.
The extension does not request or store your email account passwords. It does not install tracking cookies or send mail content to third-party websites.
Your choices
You can disable individual rules or additional folder mappings, disable Sent-copy routing, change tracking-retention settings, or remove the extension using Thunderbird. New rules and optional additional mappings start disabled. To remove local configuration and tracking data, manage Thunderbird's extension/profile storage and any profile backups; disabling a rule does not automatically erase its historical tracking data.
Contact and support
For privacy questions or support, contact alek@77soft.mk. Information you deliberately include in a support email (such as an email address, screenshots or logs) is received through normal email and used to respond to your request; avoid sending passwords, unnecessary message contents or unredacted logs. This voluntary support correspondence is separate from the extension's automatic operation.
This notice describes the BSD Local IMAP-POP Sync v3.3.2 extension code. Changes to future versions may require updating this notice.

Dodatki

Witamy na witrynie Dodatki dla programu Thunderbird.

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BSD Local IMAP-POP Sync 3.3.3

Autor: Alek

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Informacje o wersji

Wersja 3.3.3 Wydany dnia Lis. 7, 2026 42.0 KiB Działa z Thunderbird 128.0 i późniejsze

Dodatki

Witamy na witrynie Dodatki dla programu Thunderbird.

Jesteś w podróży?

BSD Local IMAP-POP Sync 3.3.3

Autor: Alek

Więcej o tym dodatku

Informacje o wersji

Wersja 3.3.3 Wydany dnia Lis. 7, 2026 42.0 KiB Działa z Thunderbird 128.0 i późniejsze

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