Currently Being ModeratedAug 17, 2012 10:34 AM (in response to Jimaroid)
Have the same thing and not found a fix yet. In fact the whole Apple Mail.app with Exchange connectivity is awful in 10.8 and I am having regular issues, brought about I believe from running the Mail.app on multiple machines.
They seem to get out of sync with each other and the only way to fix that particular problem is to perform a 'rebuild' of the mailbox.
Currently Being ModeratedAug 17, 2012 11:41 AM (in response to Jimaroid)
Well I appear to have fixed it by doing the following.
Find the following key:
And adding the aliases in something like this:
Seems to work exactly as I'd expect and it populates the email addresses in MailPreferences for the account as you'd see for iCloud account aliases.
Why you can't change this through Mail Preferences I cannot fathom.
Currently Being ModeratedOct 10, 2012 4:08 PM (in response to Jimaroid)
This was very helpful. I actually needed this to get GPGMail to work as my GPG key is tied to an alias of my Exchange mailbox. Thanks for posting the solution, also would like to see a box in preferences to add aliases. Not sure why there isn't one.
Currently Being ModeratedDec 9, 2012 6:44 AM (in response to Jimaroid)
I found this same solution trying to fix the disappearing Exchange folder problem, and got all excited for a moment until I tested it, and emails I send using an alias are received by the recipient from the main address, and the reply-to address for the recipient is also the main address. So the only place that the alias shows is when I'm composing the email and in my sent folder on Mac Mail. Have you tested it this way, and is it working correctly for you?