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Unable to add new domain to Default Email Address Policy in Exchange 2010

Sometimes I think Microsoft purposefully break the EMC GUI in Exchange 2010 to push people to use the command line console.

Doing something as simple as adding your domain to the default email policy - which will automatically create the smtp email address whenever a new mailbox is created - ends is an error.

(Organisation Configuration > Hub Transport > Email Address Policies > Default Policy)

Summary: 2 item(s). 0 succeeded, 1 failed.
Elapsed time: 00:00:00

Edit Default Policy
Failed

Error:
The operation can't be performed on the default e-mail address policy.

Exchange Management Shell command attempted:
set-EmailAddressPolicy -ConditionalDepartment @() -ConditionalCompany @() -ConditionalStateOrProvince @() -ConditionalCustomAttribute1 @() -ConditionalCustomAttribute2 @() -ConditionalCustomAttribute3 @() -ConditionalCustomAttribute4 @() -ConditionalCustomAttribute5 @() -ConditionalCustomAttribute6 @() -ConditionalCustomAttribute7 @() -ConditionalCustomAttribute8 @() -ConditionalCustomAttribute9 @() -ConditionalCustomAttribute10 @() -ConditionalCustomAttribute11 @() -ConditionalCustomAttribute12 @() -ConditionalCustomAttribute13 @() -ConditionalCustomAttribute14 @() -ConditionalCustomAttribute15 @() -RecipientContainer $null -EnabledEmailAddressTemplates 'smtp:@domain.local','SMTP:@mydomain.co.uk' -Identity 'Default Policy'

Elapsed Time: 00:00:00

Apply Default Policy
Cancelled

Not that I know why it actually fails, but I do know how to get it to work. Instead of using the EMC GUI use the command line Exchange Management Shell and the following command with updating with your domain details.

Set-EmailAddressPolicy -Identity "Default Policy" -EnabledEmailAddressTemplates SMTP:@mydomain.com,smtp:@domain.local

Note that the upper-case "SMTP" dictates which address is used as the default reply to address.

Also it may not apply straight away - so to push it out to all mailboxes, you can go back to the EMC GUI > Organisation Configuration > Hub Transport > Email Address Policies > Default Policy, Right click on the Policy and choose Apply...