Mass change of external Contact domains?

Question

We have a large number of external contacts in our GAL.  One of the companies is having a name and email domain change.
The email addresses are staying the same except for the email domain.
For instance [email protected] is now
[email protected]
How can we do a mass change of email addresses for these external mail Contacts?
We are not changing our email domain.  These are all external users added to our address list being changed.

Answer 1

Try running the following:
Get-MailContact | ? { $.ExternalEmailAddress -match 'domain.com' } | Sort Name | % { Set-MailContact -ExternalEmailAddress $_.ExternalEmailAddress.AddressString.Replace('domain.com','xyzcorp.com') }
This will work unless they are changing the left side of the email address as well as the right.  If that's the case, you'll need an export of their addresses so you can import the correct ones.