Change the phone number type to E-mail Address for the email type selected from Preference.
Set the default email to Outlook. Do not use Outlook Express.
In The Raiser's Edge 7.94 and higher, ensure the email is added on the Email Addresses tab of the Bio1 or Org1 tab.
In The Raiser's Edge 7.93 and earlier, add the email as a phone number on the preferred address.
Export the email address and use Microsoft Outlook to send the global email.