Simple Mail Transfer Protocol
Simple Mail Transfer Protocol, also referred to as SMTP, is primarily a text based protocol. In such protocol, a mail writer communicates with a mail receiver by issuing command strings and providing necessary data. These command strings are the precise words that direct a server to perform actions. This data is transmitted through a consistent ordered data stream channel. A typical SMTP session includes commands that are sent by a SMTP sender and also the corresponding responses to these commands made by a SMTP receiver. This facilitates the exchange of session parameters and thereby a session is started. Once the session is established, the sender then transmits the required information to the receiver as per the protocols that regulate the transfer of data packets.