acceptance testing (n)~ Formal testing conducted to enable a user customer or other authorized entity to determine whether to accept a product or product component. accepted domain (n)~ Any SMTP namespace for which an Exchange organization sends and receives e-mail. Accepted domains include those domains for which the Exchangeorganization is authoritative. An Exchange organization is authoritative when it handles mail delivery for recipients in the accepted domain. Accepted domains also include domains for which the Exchange organization receives mail and then relays to an e-mail server that is outside the Active Directory forest for delivery to the recipient.