Managing the Address Rewriting Agent
In Microsoft Exchange Server 2007, the Address Rewriting agent lets you modify the addresses of senders and recipients on messages that enter and leave an Exchange Server 2007 organization. The Address Rewriting agent runs on a computer that has the Edge Transport server role installed.
You can use address rewriting to present a consistent appearance to external recipients of messages from your Exchange Server 2007 organization. Address rewriting can be valuable if your organization uses third-party vendors to provide support or other e-mail based services. Your customers and partners expect e-mail to come from your organization, not from unfamiliar third-party vendors. The address rewriting feature provides organizations the flexibility to structure their businesses based on business requirements, instead of technical requirements or limitations.
You can also use address rewriting on messages that enter the Exchange Server 2007 organization to enable appropriate routing of messages that are bound for internal recipients. Address rewriting enables replies to messages that were rewritten to be correctly routed to the original sender of the rewritten message.