Delivery has failed to these recipients or groups:
admin@digitalcom.co.th
The email address you entered couldn't be found. Please check the recipient's email address and try to resend the message. If the problem continues, please contact your helpdesk.
Diagnostic information for administrators:
Generating server: dgmail.digitalcom.co.th
admin@digitalcom.co.th
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##
Original message headers: