• A communication protocol for electronic mail transmission. As an Internet standard, SMTP was first defined in 1982 by RFC 821, and updated in 2008 by RFC 5321 to Extended SMTP additions, which is the protocol variety in widespread use today. Mail servers and other message transfer agents use SMTP to send and receive mail messages. Proprietary systems such as Microsoft Exchange and IBM Notes, and webmail systems such as Outlook, Gmail, and Yahoo Mail may use non-standard protocols internally, but all use SMTP when sending to or receiving email from outside their own systems. SMTP servers commonly use the Transmission Control Protocol (TCP) on port number 25. ← Wikipedia

1. More about this term (beta): articles and videos, books, web search
2. Previous term: Simple Knowledge Organization System
3. Next term: Simple Object Access Protocol
4. Random term: Internet Corporation for Assigned Names and Numbers (or roll the dice with webglossary.info/random)