Looks like it's still not possible to send from alias addresses with the provided SMTP server.
Outlook.com allows users to have up to 10 different alias email addresses, and the users can send emails using any of those alias addresses provided that they are sending from the desktop website of Outlook.com or the Windows 8 Mail app. However, users can only send from one of their alias addresses if users set up their Outlook.com account on any other mail client, whether using POP, IMAP, or EAS. That includes the official Outlook.com app for Android[1] and the desktop Outlook 2013 client[2], plus Thunderbird and other desktop mail clients[3].
I do hope that this issue gets addressed in the near future.
Outlook.com allows users to have up to 10 different alias email addresses, and the users can send emails using any of those alias addresses provided that they are sending from the desktop website of Outlook.com or the Windows 8 Mail app. However, users can only send from one of their alias addresses if users set up their Outlook.com account on any other mail client, whether using POP, IMAP, or EAS. That includes the official Outlook.com app for Android[1] and the desktop Outlook 2013 client[2], plus Thunderbird and other desktop mail clients[3].
I do hope that this issue gets addressed in the near future.
[1] http://answers.microsoft.com/en-us/windowslive/forum/mail-sy...
[2] http://answers.microsoft.com/en-us/office/forum/office_2013_...
[3] http://answers.microsoft.com/en-us/windowslive/forum/mail-em...