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Sendmail acts a unified "post office" to which all mail can be submitted.
Address interpretation is controlled by a production system, which can
parse both domain-based addressing and old-style "ad hoc" addresses.
The production system is powerful enough to rewrite addresses in the message
header to conform to the standards of a number of common target networks,
including old (NCP/RFC733) Arpanet, new (TCP/RFC822) Arpanet, UUCP, and
Phonenet. Sendmail also implements an SMTP server, message queueing, and
aliasing.
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