It checks the MX record from Domain Name System to obtain the target domain. To relay the email, the MTA will find the target domain. If the domain name of the recipient's email address is different from the sender's domain name, then MSA will send the mail to the Mail Transfer Agent (MTA). For example,, where "vivek" is the username of the recipient and "" is the domain name.
Delivery of Mail: E-mail addresses contain two parts: username of the recipient and domain name. Submission of Mail: After composing an email, the mail client then submits the completed e-mail to the SMTP server by using SMTP on TCP port 25. In this case, the message body is like a letter and header is like an envelope that contains the recipient's address. 
The header also includes descriptive information such as the subject of the message. The body is the main part of the message while the header includes information such as the sender and recipient address. The message contains two parts: body and header. Mail User Agent is a program which is used to send and receive mail.
Composition of Mail: A user sends an e-mail by composing an electronic mail message using a Mail User Agent (MUA). The mail gateway is a relay MTA that can be used to receive an email. The relaying system without TCP/IP protocol can also be used to send the emails to users, and this is achieved by the use of the mail gateway. Instead of just having one MTA at sending side and one at receiving side, more MTAs can be added, acting either as a client or server to relay the email. SMTP allows a more complex system by adding a relaying system. The mail transfer agent (MTA) transfers this mail across the internet. The user agent (UA) prepares the message, creates the envelope and then puts the message in the envelope. First, we will break the SMTP client and SMTP server into two components such as user agent (UA) and mail transfer agent (MTA). For example, if the recipient address is wrong, then receiving server reply with an error message of some kind. They also have a way of handling the errors such as incorrect email address. The servers have a way of identifying themselves and announcing what kind of communication they are trying to perform. 
The main purpose of SMTP is used to set up communication rules between servers. It can also send the messages on networks outside the internet. Sending message can include text, voice, video or graphics. It can send a single message to one or more recipients. It provides a mail exchange between users on the same or different computers, and it also supports:. It is a program used for sending messages to other computer users based on e-mail addresses. SMTP is a set of communication guidelines that allow software to transmit an electronic mail over the internet is called Simple Mail Transfer Protocol. SMTP stands for Simple Mail Transfer Protocol.
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