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English thesaurus
Simple Mail Transfer Protocol
abbr., file.ext.	SMTP
IT	The standard electronic mail e-mail protocol on the Internet
IT, abbr.	SMTP (RFC 821, TCP/IP)
telecom., abbr.	SMTP (IETF)
Simple Mail Transfer Protocol A member of the TCP/IP suite of protocols that governs the exchange of electronic mail between message transfer agents
abbr., comp., MS	SMTP (Simple Mail Transfer Protocol)

Simple : 6 phrases in 4 subjects

Economics	1
Electric machinery	1
Mathematics	3
Microsoft	1