You can change the email address patter by modifying the string in {$_.AddressString -like '*@test.com'} section.I am using Get-Mailbox and Set-Mailbox cmdlets. So make sure to import the Exchange PowerShell module before executing this script (or update the script with Import-M
This script is tested on these platforms by the author. It is likely to work on other platforms as well. If you try it and find that it works on another platform, please add a note to the script discussion to let others know.