How email delivery works

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Although it is not possible to visually observe the flow of email delivery, email delivery is made possible by the functions of multiple software programs contained in the sending server and receiving server.

The MTA is involved with the "SMTP server", which is the sending server. In addition to the MTA, the SMTP server also contains functions such as MUA and MDA, which enable email delivery. The insurance leads for seniors sent email is received by the recipient's receiving server, "POP3" or "IMAP", and the contents are confirmed by the MUA.




Explaining how to build an email distribution system and its advantages and disadvantages!
Many companies use email distribution to advertise their products and services, nurture customers, and strengthen contact points. An essential part of email distribution is an "email distribution system." In this article, we will explain what an email distribution system is, the advantages and disadvantages of building your own email distribution system, and what to do when you cannot build your own email distribution system.
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The role of MUA
MUA stands for "Mail User Agent" and is email software used to compose emails and view received emails. Gmail and Outlook are also types of MUA, and users use MUA to upload emails they create and send to the SMTP server.



The Role of MSA
MSA stands for "Message Submission Agent" and refers to software that has user authentication functions and accepts emails sent by users.



The role of MDA
MDA stands for "Mail Delivery Agent" and stores emails transferred from MTA in the appropriate mailbox. It is a local delivery program and is not involved in sending email between systems.



The Role of the MTA
The MTA is what is commonly known as a "mail server" or "SMTP server," and uses the SMTP protocol to send email. It queries the DNS server to obtain the IP address of the destination mail server. Based on the obtained IP address, it forwards the email received from the MUA to the destination mail server. If we compare it to mail, it is like a post office that sorts mail placed in a mailbox (MUA) and hands it over to the mail carrier (MDA).

The MTA plays most of the core roles of a mail server, and if it does not function, mail cannot be sent. When mail is sent from an MUA, the mail transfer route is determined based on the domain and transferred via SMTP. If the mail cannot be delivered to the specified recipient due to an unknown destination or an error, the main job of the MTA is to send an error mail to the Return-Path (a reply address that notifies the sender that the mail has failed).

In many cases, it is combined with an MDA, and the SMTP server or mail server itself is sometimes called an MTA.