simple mail transfer protocol (SMTP)

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Set of standards that regulate the transfer of email over networks such as internet. SMTP transfers mail in plain text, without any security (encryption) support, and from server to server only. The mail recipient must use post office protocol (POP) to transfer messages to his or her computer. For enhanced text, and secure data transmission, advanced protocols such as multipurpose internet mail extensions (MIME) and secure mime (S/MIME) are used.

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