PowerShell function to create an X500 proxy address from a IMCEAEX NDR

Create-X500ProxyAddressFromLegacyExchangeDN.ps1

Function Create-X500ProxyAddressFromLegacyExchangeDN($Address) {
  # As per https://support.microsoft.com/en-au/help/2807779/imceaex-non-delivery-report-when-you-send-email-messages-to-an-interna
  $Address = $Address.Replace('_','/')        # Replace any underscore character (_) with a slash character (/)
  $Address = $Address.Replace('+20',' ')      # Replace "+20" with a blank space
  $Address = $Address.Replace('+28','(')      # Replace "+28" with an opening parenthesis character
  $Address = $Address.Replace('+29',')')      # Replace "+29" with a closing parenthesis character.
  $Address = $Address.Replace('IMCEAEX-','')  # Delete the "IMCEAEX-" string
  $Address = $Address.Split('@')[0]           # Delete the "@mgd.domain.com" string
  $Address = "X500:$Address"                  # Add "X500:" at the beginning
  $Address
}

And yes, I've seen this one: http://www.o-xchange.com/2014/07/script-for-converting-bounce-back.html

I prefer this more verbose method, as it's clearer for someone to pick up on what the script's doing.