10.6.2 broke my Mail plugin! :-(
Apple has changed the way that Mail.app interacts with plugins in Snow Leopard.
As Ken Aspelagh describes it
on the Mac Observer:
“Each new version of Mail and the associated Message framework includes a unique code. Plug-ins have to explicitly declare themselves compatible with each new version,” Mr. Aspeslagh told The Mac Observer. “There is some sense to this as plug-ins are closely tied to the inner working of Mail, and stand the chance of breaking when Mail.app updates. Apple didn’t want to take this chance, so now they automatically disable all plug-ins with each update.”
So today’s 10.6.2 update is likely to break some plugins.
Most developers are only too aware of this issue, and will get updated plugins out fast.
Greg Welch, who develops the MailRecent and MailFollowUp plugins, has already got new, 10.6.2-compatible versions
out the door.
Eric Hinterbichler has done the same with his new Herald Notification utility.
Other developers are sure to follow quickly. Some acted weeks before the update appeared, like Aaron Harnly who pushed out a compatible version of his Letterbox plugin
three weeks ago.
10.6.2 broke the Mail clipping plugin from Omnifocus, but fortunately this can be restored simply by reinstalling it.
Other plugins, especially those not so actively or quickly supported, might be more difficult.
langui.sh has published
some Terminal commands that will (potentially) revive other busted plugins. He has written them for GrowlMail but they could easily be adapted for other plugins, and “trick” them into working again.
It’s worth a shot, especially if you are in love with a plugin that’s not so well supported. However, maybe make a backup of the plugin’s bundle first. You know, just in case.
Similar Posts:
- Fix GrowlMail after 10.6.4 update
- Plugin List adds 122 Leopard Mail Templates
- Plugin to scan for missing attachments
- It lives! The Return of MailTemplate
- MailTunes: A great idea, but….
Tags: Apple, Apple Mail, mail.app, plugins, snow leopard, UUID

November 10th, 2009 at 10:51 pm
Can I add Growl Mail plug-in to the casualties of 10.6.2
November 11th, 2009 at 2:57 am
As far as the plugin for DEVONthink Pro Office is concerned: just reinstall it again and it will work.
November 11th, 2009 at 3:11 am
Open the bundle contents, edit the Info.plist, and add to the SupportedPluginCompatibilityUUID, the last two:
225E0A48-2CDB-44A6-8D99-A9BB8AF6BA04
B3F3FC72-315D-4323-BE85-7AB76090224D
2610F061-32C6-4C6B-B90A-7A3102F9B9C8
99BB3782-6C16-4C6F-B910-25ED1C1CB38B
2F0CF6F9-35BA-4812-9CB2-155C0FDB9B0F
0CB5F2A0-A173-4809-86E3-9317261F1745
Works with GrowlMail, Letterbox, and Mail Attachments Iconizer.
November 11th, 2009 at 8:55 am
Update for Mail.Appetaize is out. Here: http://bit.ly/uI9Vd
November 11th, 2009 at 7:07 pm
Letterbox also got busted, but the BETA works fine. :)
http://harnly.net/2009/software/letterbox/letterbox-beta-5-for-snow-leopard/#more-240
November 12th, 2009 at 5:28 pm
SigPro is broken as well :-(( my favourite plugin for Mail as it palyed my Itunes as a sig.
November 12th, 2009 at 5:30 pm
UPDATE: a fix released .. thx
http://www.littleknownsoftware.com/2009/11/signatureprofiler_153_released.php
December 1st, 2009 at 9:41 am
After installing Snow Leopard every time I get an automatic update I lose the ability to send email. I have both Outlook Express &Mac installed but neither of them work. So frustrating since I am such a novice that I don’t know what I do, if in fact I do anything, to reverse this. Can anyone help me to fix & understand this annoying problem?
January 19th, 2010 at 6:04 pm
tried installing the update fix for SigPro as stated here http://www.littleknownsoftware.com/blog/tag/sigpro/ but still my Maill.app on 10.6.2 will disable the SigPro plug-in.
Need to make it work but do not know how.. Can anyone help?
June 18th, 2010 at 12:30 am
What about TruePreview? Will there be an update for that?