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EXTENDING POSTBOX

Postbox Add-Ons and Dictionaries

Postbox provides a mechanism that allows add-ons from 3rd party developers to be installed within the application. Add-ons extend the functionality of Postbox in ways that provide additional benefit and control over your email experience.

Unmodified Thunderbird add-ons do not work within Postbox, but developers of existing Thunderbird add-ons can port their add-ons to Postbox (see Note to Developers). If there is a particular add-on that you would like to see in Postbox, please contact the add-on developer directly to request compatibility with Postbox.

Trouble-Shooting and Support

Please note that add-ons can change the DNA of Postbox in ways that are incompatible with its default behavior. If Postbox is not operating the way you expect, our recommendation is to temporarily disable add-ons to see if the problem clears up for you.

Postbox does not support the functionality of 3rd part add-ons, as it is up to each developer to support the functionality of the add-ons they author. If an add-on is not working correctly, please contact the add-on developer directly.

Installation

  • Download and save the add-on to your hard drive. (Firefox users, be sure to right-click the download link, then select "Save Link As..." from the contextual menu.)
  • In Postbox, go to Tools | Add-ons.
  • Click the Install button and select the file you downloaded and click "OK".

For information about installing dictionaries in Postbox, see this Knowledge Base Article.

Postbox 3.0 Add-ons

Please contact the authors of these add-ons if you experience any issues.

Lightning Mozilla Calendar Team Manage your daily schedule directly within Postbox. Download
Provider for Google Calendar Philipp Kewisch Allows bidirectional access to Google Calendar. Download
Todoist for Postbox Doist Get the only to-do app that integrates seamlessly into Postbox. Download
Zonio 3e Calendar Zonio Schedule meetings directly from your calendar without a lot of phone calls, emails or clicking in the polls. Download
SpamSieve C-Command Software Integrate Postbox with SpamSieve's powerful junk filtering on Mac OS X. Download for Mac OS X
Markdown Here Adam Pritchard Markdown Here allows you to write complex email in simple text, never taking your hands off the keyboard Download
MyPhoneExplorer FJ Software Development MyPhoneExplorer will bring Postbox and your Android Smartphone together. With MyPhoneExplorer you can sync your contacts, calendar and task list with every android powered device. Download
ImportExportTools kaosmos Import and Export Messages. Download
QuickFilters Axel Grude Quickly generate mail filters on the fly, by dragging and dropping mails and analyzing their attributes. Download
Enigmail 1.2 The Enigmail Team Send and receive signed and encrypted messages using OpenPGP provided by GnuPG. You also need to install GnuPG. Download for Mac OS X Download for Windows
MinimizeToTray Revived Nils Maier Minimizes Postbox to the system tray on Windows. Download
Vacuum Postbox Postbox Adds a "Tools | Indexing | Vacuum..." menu item which allows you to vacuum your Postbox index to reclaim disk space and improve performance. Download
ThunderBrowse GS! Networks Adds browsing functions to Postbox, allowing you to be able to view websites without having to open another application. Download
MailHops Andrew Van Tassel MailHops maps the route an email took to get to you. Download
Zindus Leni Mayo Google and Zimbra contact sync. Download
Quicktext Emil Hesslow Quicktext lets you create templates that can be easily inserted into outgoing messages. Download
Send Later 3 Jonathan Kamens True "Send Later" functionality to schedule the time for sending an email. Download
Zombie Keys (Multilanguage Keyboard) Axel Grude, Kai Bolay Enter European languages (which include diacritics (accented characters, diaeresis, umlauts, etc.), ligatures, the Euro sign, etc.) into Postbox using an English keyboard. Download
QuickPasswords Axel Grude This simply puts the password where you need it - the login form or your clipboard. Download
QuickFolders Axel Grude, Alexander Malfait Open your favorite folders as tabs. Open folders and sub folders, move mails without scrolling around or searching. Download
WiseStamp The WiseStamp Team Share your Social profiles and information you care about in your email signatures. Download

Postbox 2.5 Add-ons

Please contact the authors of these add-ons if you experience any issues.

Lightning Mozilla Calendar Team Manage your daily schedule directly within Postbox. Download
Provider for Google Calendar Philipp Kewisch Allows bidirectional access to Google Calendar. Download
Provider for Microsoft Exchange Calendar Simon Schubert Allows bidirectional access to Microsoft Exchange Calendar when using Lightning Calendar for Postbox. Download (BETA)
SpamSieve C-Command Software Integrate Postbox with SpamSieve's powerful junk filtering on Mac OS X. Download for Mac OS X
Enigmail 1.2 The Enigmail Team Send and receive signed and encrypted messages using OpenPGP provided by GnuPG. You also need to install GnuPG. Download for Mac OS X Download for Windows
ImportExportTools kaosmos Import and Export Messages. Download
Highlighter André Rodier Adds a button to highlight selected text in your choice of color while composing a message. Download
QuickFolders Alexander Malfait, Axel Grude QuickFolders turns folders you select into Tabs. Supports fast navigation, sorting of mails and color customization. Download
Quicktext Emil Hesslow Quicktext lets you create templates that can be easily inserted into outgoing messages. Download
Virtual Identities Rene Ejury Allows you to modify your Identity settings for a single Mail on the fly. Download (BETA)
Ultra Recall Kinook Software Import Postbox messages into Ultra Recall. Download
Zindus Leni Mayo Google and Zimbra contact sync. Download
Growl/GNTP Brian Dunnington Sends GNTP (Growl) notifications when new messages or feed items arrive. Download
Send Later 3 Jonathan Kamens True "Send Later" functionality to schedule the time for sending an email. Download
Undigestify Jonathan Kamens Undigestify RFC 1153 digest messages. Download
MailHops Andrew Van Tassel MailHops maps the route an email took to get to you. Download
Vacuum Postbox Postbox Adds a "Tools | Indexing | Vacuum..." menu item which allows you to vacuum your Postbox index to reclaim disk space and improve performance. Download
Javascript Debugger Mozilla Add-on developer tool. Download
DOM Inspector Mozilla Add-on developer tool. Download

Postbox 2.1 Add-ons

Please contact the authors of these add-ons if you experience any issues.

Lightning Mozilla Calendar Team Manage your daily schedule directly within Postbox. Download
Provider for Google Calendar Philipp Kewisch Allows bidirectional access to Google Calendar. Download
Provider for Microsoft Exchange Calendar Simon Schubert Allows bidirectional access to Microsoft Exchange Calendar when using Lightning Calendar for Postbox. Download (BETA)
SpamSieve C-Command Software Integrate Postbox with SpamSieve's powerful junk filtering on Mac OS X. Download for Mac OS X
Enigmail 1.1.2 The Enigmail Team Send and receive signed and encrypted messages using OpenPGP provided by GnuPG. You also need to install GnuPG. Download for Mac OS X Download for Windows
ImportExportTools kaosmos Import and Export Messages. Download
Highlighter André Rodier Adds a button to highlight selected text in your choice of color while composing a message. Download
QuickFolders Alexander Malfait, Axel Grude QuickFolders turns folders you select into Tabs. Supports fast navigation, sorting of mails and color customization. Download
Quicktext Emil Hesslow Quicktext lets you create templates that can be easily inserted into outgoing messages. Download
Virtual Identities Rene Ejury Allows you to modify your Identity settings for a single Mail on the fly. Download (BETA)
Ultra Recall Kinook Software Import Postbox messages into Ultra Recall. Download
Zindus Leni Mayo Google and Zimbra contact sync. Download
Growl/GNTP Brian Dunnington Sends GNTP (Growl) notifications when new messages or feed items arrive. Download
ThunderBrowse GS! Networks Adds browsing functions to Postbox, allowing you to be able to view websites without having to open another application. Download
ReminderFox Günter Wahl, Tom Mutdosch, Daniel Lee ReminderFox displays and manages lists of date-based reminders and ToDos. Download
Send Later 3 Jonathan Kamens True "Send Later" functionality to schedule the time for sending an email. Download
Undigestify Jonathan Kamens Undigestify RFC 1153 digest messages. Download
MailHops Andrew Van Tassel MailHops maps the route an email took to get to you. Download
Vacuum Postbox Postbox Adds a "Tools | Indexing | Vacuum..." menu item which allows you to vacuum your Postbox index to reclaim disk space and improve performance. Download
Javascript Debugger Mozilla Add-on developer tool. Download
DOM Inspector Mozilla Add-on developer tool. Download

Postbox 1.1 Add-ons

Here are add-ons compatible with Postbox 1.1. Please contact the authors of these add-ons if you experience any issues.

Lightning Mozilla Calendar Team Manage your daily schedule directly within Postbox. Download
Provider for Google Calendar Philipp Kewisch Allows bidirectional access to Google Calendar. Download
Enigmail The Enigmail Team Send and receive signed and encrypted messages using OpenPGP provided by GnuPG. You also need to install GnuPG. Download for Mac OS X Download for Windows
ImportExportTools kaosmos Import and Export Messages. Download
Hebrew Calendar Igor ZC Show the Hebrew date in the status bar. Download
mailredirect Pawel Krzesniak and Ronald Wahl Adds ability to redirect one or more mails to one or more recipients. Download
MinimizeToTray Plus Michael Buckley Minimizes Postbox to the system tray on Windows. Download
MozBackup Pavel Cvrček Utility for backing up and restoring Postbox settings and mail. Be sure to install version 10.4.10 or higher! Download (BETA)
Nostalgy Alain Frisch Keyboard shortcuts to change folder, move/copy messages, with folder name auto-completion. Download
QuickFolders Alexander Malfait, Axel Grude QuickFolders turns folders you select into Tabs. Supports fast navigation, sorting of mails and color customization. Download
Quicktext Emil Hesslow Quicktext lets you create templates that can be easily inserted into outgoing messages. Download
Virtual Identities Rene Ejury Allows you to modify your Identity settings for a single Mail on the fly. Download (BETA)
World Weather+ Mel Reyes (aka: mrtech) Displays local weather information from around the world. Download
Ultra Recall Kinook Software Import Postbox messages into Ultra Recall. Download
Zindus Leni Mayo Google and Zimbra contact sync. Download
Growl/GNTP Brian Dunnington Sends GNTP (Growl) notifications when new messages or feed items arrive. Download
OpenMedSpel medical spelling dictionary e-MedTools A medical spell checking dictionary that includes nearly 50,000 medical terms ranging from abdominis to zygomatic. Download
Javascript Debugger Mozilla Add-on developer tool. Download
DOM Inspector Mozilla Add-on developer tool. Download
Vacuum Postbox Postbox Adds a "Tools | Indexing | Vacuum..." menu item which allows you to vacuum your Postbox index to reclaim disk space and improve performance. Download

Note to Developers

Here are a few resources that you may find helpful to your porting efforts:

  1. Postbox is based on Mozilla Thunderbird, but Postbox is not open-source. But you can find some of the code here http://postbox-inc.com/coveredcode. (People trying to port Thunderbird add-ons have found this useful.)
  2. For a version of the DOM Inspector that will work with Postbox 3.0, see http://download.getpostbox.com.s3.amazonaws.com/addons/inspector/inspector-2.0.9.xpi
  3. For a version of the JS Debugger (venkman) that will work with Postbox 3.0, see http://download.getpostbox.com.s3.amazonaws.com/addons/venkman/venkman-0.9.88.2.xpi
  4. To make an add-on for work for Postbox 3, you'll need to add this in the extension's install.rdf file:
    <em:targetApplication>
        <!-- Postbox -->
        <Description>
            <em:id>postbox@postbox-inc.com</em:id>
            <em:minVersion>3.0</em:minVersion>
            <em:maxVersion>3.*</em:maxVersion>
        </Description>
    </em:targetApplication>