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Simple Mail Transfer Protocol: a protocol for transferring email messages over the internet.
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Origin of SMTP
First recorded in 2000–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for SMTP
The attackers used a little-documented feature of most basic email (SMTP) servers called an “open relay.”
British Dictionary definitions for SMTP
simple mail transfer protocol: a protocol that enables e-mails to be sent between different servers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for SMTP
[ ĕs′ĕm-tē-pē′ ]
Short for Simple Mail Transfer Protocol. A protocol used on TCP/IP networks governing the transfer of e-mail.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.