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Simple Mail Transfer Protocol
Simple Mail Transport Protocol
the primary protocol used to transfer electronic mail messages on the Internet.
NISTIR 7250 under Simple Mail Transfer Protocol
NISTIR 7387 under Simple Mail Transfer Protocol
Comments about specific definitions should be sent to the authors of the linked Source publication. For NIST publications, an email is usually found within the document.
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See NISTIR 7298 Rev. 3 for additional details.