PROBLEMWhen sending an outbound fax email using Microsoft Outlook 2003 / 2007 / 2010 to email@example.com, the sender may receive theerror message from Microsoft Exchange: 550 5.1.1 firstname.lastname@example.org User Unknown.
The e-mail address of the recipient was not found in the e-mail system of the recipient.
or Delivery has failed to these recipients or groups:
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message.
- GFI FaxMaker
- Microsoft Exchange 2007 / 2010