What Is Simple Mail Transfer Protocol (SMTP)?
SMTP is used to send and receive email. It is sometimes paired with IMAP or POP3 (for example, by a user-level application), which handles the retrieval of messages, while SMTP primarily sends messages to a server for forwarding. SMTP can both send and receive mail, but it’s bad at queuing incoming messages, hence the common delegation to other protocols. Proprietary systems like Gmail have their own mail transfer protocols when using their own servers, but they still use good old SMTP to email beyond that.
How Does SMTP Work?
SMTP is an asymmetrical protocol, meaning that there are many clients interacting with one server, using a basic model popular in the 1980s which is now mostly defunct outside of email protocols. SMTP runs on TCP/IP and listens on port 25.
What’s the Difference Between SMTP and Extended SMTP?
ESMTP is a new version of SMTP with added functionality. Released in 1995, it can send multimedia files. Now your aunt can attach videos of her cat to her weekly email update. Thanks, Internet.

✳️ SMTP stands for Simple Mail Transfer Protocol.

✳️ SMTP is a set of communication guidelines that allow software to transmit an electronic mail over the internet is called Simple Mail Transfer Protocol.

✳️ It is a program used for sending messages to other computer users based on e-mail addresses.

✳️ It provides a mail exchange between users on the same or different computers, and it also supports:

💠 It can send a single message to one or more recipients.
💠 Sending message can include text, voice, video or graphics.
💠 It can also send the messages on networks outside the internet.
💠 The main purpose of SMTP is used to set up communication rules between servers. The servers have a way of identifying themselves and announcing what kind of communication they are trying to perform. They also have a way of handling the errors such as incorrect email address. For example, if the recipient address is wrong, then receiving server reply with an error message of some kind.

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