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The MsgFiler Engine is an Apple Mail Plugin that is an optional add-on for MsgFiler 3. It speeds up mailbox loading and filing performance to remote IMAP mailboxes.
You do not need to install the MsgFiler Engine Mail Plugin in order to use MsgFiler.
Download
Download MsgFiler Engine 1.0.8 for use with MsgFiler 3. Version 1.0.8 is required for use with Mac OS X Lion.
Download MsgFiler Engine 1.0.8 for MsgFiler 3
Installation
MsgFiler Engine is an Apple Mail Plug-In. To install MsgFiler Engine, follow these instructions:
- Double-click on the MsgFiler Engine Installer icon.
- Follow the on-screen directions for installing MsgFiler Engine.
- Launch the MsgFiler 3 application.
- Choose Preferences from the MsgFiler menu.
- In the window that appears, click Filing.
- Check Use MsgFiler Engine to file messages.
- Enable access for assistive devices must be checked in the Universal Access pane of System Preferences.

NOTE #1: When using the MsgFiler Engine, the ability to move the selection up or down will be disabled in favor of Mail’s selection behavior after filing.
NOTE #2: Undo/Redo support is handled by Apple Mail instead of MsgFiler.
Support Questions and Known Issues
- Filing is so slow after upgrading to Lion!
- Re-install MsgFiler Engine. All Mail plugins are automatically disabled following an upgrade of the operating system.
- MsgFiler Engine 1.0.3 or lower does not file messages in Lion.
- Install the latests version of MsgFiler Engine. It brings compatibility to Mac OS X Lion.
- MsgFiler and Mail hang when filing using the Engine.
- Fixed in MsgFiler 3.0.1. If you are running an older version of MsgFiler, turn off the preference to Keep Open After Filing in MsgFiler Preferences.
- Nothing happens when I use the Engine to file messages.
- MsgFiler Engine requires Access for assistive devices be turned on in the Universal Access preferences pane of System Preferences. Also be sure to be running MsgFiler 3.0.1 and MsgFiler Engine 1.0.2.
- I’m an old user of the MsgFiler Mail Plugin. Installing MsgFiler Engine makes the original mail plugin disappear.
- Install the latest version of MsgFiler Engine to resolve this problem.
- I am running SpamSieve and Mail crashes at startup.
- Make sure you are running MsgFiler Engine 1.0.6 or higher.
- How do I remove MsgFiler Engine?
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To remove the MsgFiler Engine Mail Plugin, follow these steps:
- Quit Mail if it is currently running.
- Go to the Finder.
- Open your Home folder by pressing Command-Shift-h.
- Open Library.
- Open Mail.
- Open Bundles.
- Move the folder MsgFilerEngine.mailbundle to a new location.
- Restart Mail.
Version History
- Version 1.0.0 – 2011-02-24
- Initial release
- Version 1.0.1 – 2011-03-07
- Support for MsgFiler 3.0.1
- Version 1.0.2 – 2011-03-09
- Fixed bug preventing filing of messages to local mailboxes on non-English machines.
- Version 1.0.3 – 2011-04-25
- Faster loading of mailboxes with MsgFiler 3.0.2
- Version 1.0.4 – 2011-06-08
- OS X 10.7 Lion compatibility.
- Version 1.0.5 – 2011-08-24
- OS X 10.7 Lion compatibility.
- Version 1.0.6 – 2011-09-08
- Compatibility with SpamSieve.
- Version 1.0.7 – 2011-10-11
- Support for offline accounts.
- Version 1.0.8 – 2011-12-27
- Compatibility fixes.

msgfiler engine doesn’t seem to work – even though I installed the plugin, msgfiler still says it is not installed.
You need to check Enable access for assistive devices in Universal Access System Preferences for this to work. I’ll make this more clear in the documentation and on the app in the next release.
Does MsgFiler.app also have to be running for the engine to function?
Yes, MsgFiler Engine requires MsgFiler to be running. MsgFiler app does not require MsgFiler Engine to work. It’s just there in case you want faster filing to remote IMAP mailboxes.
It doesn’t seem to work: the message is reported as “filed” but it remains in the original mailbox. If I disable the “Use MsgFiler Engine…” option, it works. Assistive devices access is enabled and MsgFiler is running.
@Sergio – Have you removed the original MsgFiler Plugin mail bundle from bundles or are both still there?
Same here. Assistive devices access is enabled, MsgFiler is running, removed the original MsgFiler Plugin mail bundle from bundles. Message is reported as “filed” but it remains in the original mailbox.
G’day Adam,
I suggest that you add a script to the installer to enable assistive devices (or to the app when choosing the option to use the plugin) and to remove the “old” plugin…..
It is a pity that you have to go for this kind of clunky workaround – I hope that Apple loosens the rules on plugins so that you can make it a properly integrated experience!
I bought the new version because I’m a long-time user and want to support development. That said, I’m going to continue to use my old plug-in as long as it works. Thanks for jumping through the Apple hoops though Adam and keeping this invaluable tool available.
One thing you might look at is that if Mail isn’t running, you can’t check the “use MsgFiler Engine…” box.
I have submitted MsgFiler 3.0.1 to the Mac App Store. It features a number of bug fixes and performance improvements, such as MUCH faster loading and creation of mailboxes. Spell Catcher compatibility is there and fixed bugs related to the use of the MsgFiler Engine Mail Plugin. Stay tuned for when the app is available to update from the Mac App Store.
I just bought 3.0 is it possible to get just the uppdate from you
“Enable access for assistive devices must be checked in the Universal Access pane of System Preferences.” -> Can’t find this, as my system language is German and all sorts of trying to translate this failed… Screenshot?
Sent you a screenshot via email. The checkbox is the second from the bottom.
I am using the old version of MsgFiler now. If I upgrade to version 3, is it the case that I will have to accept either an icon in the dock or an icon in the status bar? Can I run version 3 headless, like version 2?
John – You can turn off both via MsgFiler’s preferences. you should, however, install the MsgFIler Engine mail plugin to get the same performance of the original plugin in the new app.
Great! I just made the upgrade to version 3.
Any news on comptibility with 10.7.3?
Download 1.0.8, which works in 10.7.3. OS X updates routinely disable all Mail plugins. I typically have a new release of the Engine plugin at the same time the OS update comes out.
I just tried re-downloading 1.0.8 with 10.7.3 and it isn’t working. Keeps complaining that an unsupported plug in was found and disabled.
Try this link. I wonder if your browser may have cached a previous version of MsgFiler (since the disk image has the same name everytime):
http://msgfiler.com/downloads/MsgFilerEngine108.dmg.zip
I’m having trouble here too with 10.7.3. I reinstalled and it works for a bit, then crashes and freezes up mail.
Check MsgFiler preferences and set Preferences / Filing / Label filed messages to None. Also make sure that Use MsgFiler Engine to file messages is checked.
It looks like that did the trick! Thank you Adam. Your product is outstanding and makes my life better every day.