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Internet mail addresses in Domino Release 5
When looking up an address for Internet mail in the Domino Directory in Release 5, Domino checks the $Users view for an exclusive match of the address. If it finds the complete Internet address of the recipient (for example, jdoe@acme.com) in either the Short name or Internet address field, Domino delivers the message to the mail file of that person. Domino also delivers based on a match of the local part of the address (for example, jane_doe) with any of the fields in the Person document. For example, if the message is addressed to jane_doe@acme.com, and Domino finds a Person document with the entry "Jane Doe" in the User Name field, Domino delivers the message to Jane Doe's mail file.
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