| 摘要 |
A message transfer agent (MTA) in a network domain on a network receives an email, the envelope of which contains the address of the intended recipient. The MTA accesses account data of the intended recipient to identify a realm of the intended recipient, from a plurality of realms defined within the network domain. Each realm may include one or more MTAs. The MTA determines whether it is responsible for the realm of the intended recipient and, if so, stores the communication in an associated message store server. If the MTA is not in the realm of the intended recipient, then it identifies an MTA responsible for the realm of the intended recipient within the same network domain and relays the email within the network domain to the other MTA, without altering the recipient address of the email.
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