SMTP.

What is Protocols?

• All we know that all the online activities is made possible with the help of protocols.
• Protocols are simply a set of rules and regulations with the help of those we can communicate or transmit any kind of data over the network.
• It means all the people who want to access the service of network, will have to follow the protocols 
• The protocols are vital to your networking activity and, fortunately for you, you don't need to manage, install or even think about them. 
• They're built in to the networking software on your computers. 
• That's the case with a term that affects every email you've ever sent out in your entire life—Simple Mail Transfer Protocol, or SMTP. 
• Without it, your emails would go nowhere.

What is SMTP stand for ?

• 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 that is 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.
• 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. 
• Note:- 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.

More about SMTP.

• SMTP is part of the application layer of the TCP/IP protocol. 
• Using a process called "store and forward" SMTP transfer your email on and across networks. 
• It works closely with something called the Mail Transfer Agent (MTA) to send your communication to the right computer and email inbox.

Working of SMTP.

• SMTP provides a set of codes that simplify the communication of email messages between email servers. 
• It's a kind of concept that allows a server to break up different parts of a message into different-2 categories that other server can understand. 
• When you send a message out, it's turned into strings of text that are separated by the code words (or numbers) that identify the purpose of each section.

• As each message travels towards its destination, it sometimes passes through a number of computers(set) as well as their individual MTAs. 
• As it does, it's briefly stored before it moves on to the next computer in the path. 
• Think of it as a letter going through different hands as it winds its way to the right mailbox.