This partially solved my problem – list is showing up in Microsoft Outlook, however I am still unable to send an email. I get a new error message which reads:
Delivery has failed to these recipients or groups:
'Ernst & Haas Team'
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your help desk.
Any other suggestions??????