A customer tries to configure mail forwarding for their Hosted Exchange mailbox in POA Customer Control Panel.
When specifying more than one email in the 'E-mail address' field, the error is displayed: 'Error: Invalid e-mail address.':
Forwarding can only be configured to single email address.
A customer may create a new Exchange distribution list in POA Control Panel, add all email addresses that should receive forwarded mail to that list, and then use the address of the created distribution list in forwarding configuration of their mailbox.
Information on managing distribution lists is available in POA Subscriber's Guide: Managing Distribution Lists.