What is MTA

MTA refers to Mail Transfer Agent, a software application used in the Internet Mail Handling System (MHS); it can transfer messages between computers and transfer email from one computer to another on a computer.

#The operating environment of this article: Windows 7 system, Dell G3 computer.

MTA, or Mail Transfer Agent, is a software application used in the Internet Mail Handling System (MHS); it can transfer messages between computers and transfer email from one computer to another on a computer.

The main function of MTA is to correctly forward the received incoming message to the end user or destination; the basic platform of MTA is a switching system with client/server architecture.

How does a Mail Transfer Agent (MTA) work?

The MTA is hidden from ordinary users and runs in the background, while users usually interact directly with the Mail User Agent (MUA).

Normally, an MTA receives electronic messages from other clients, either from the MUA or another MTA, and then transmits the messages to their appropriate destinations.

If the mail recipient's mailbox is not hosted locally, the mail will be relayed, that is, the mail will be automatically forwarded to another MTA. If the email recipient's mailbox is hosted locally, the final delivery of the email to the recipient's mailbox is the task of the Mail Delivery Agent (MDA). To do this, the MTA transmits the message to the message processing service component of the Message Delivery Agent (MDA).

Whenever the MTA receives an email message, it adds a Received trace header field at the top of the message header, which means: "Received", thereby building a processing message The MTA records the order to maintain the routing hierarchy for all messages.

Main functions of MTA

1. Accept messages from the Mail User Agent (MUA) and forward them to the destination (other mail User Agent)

2. Receive all messages sent from other Mail User Agents (MUA) for further transmission

3. Track each activity and analyze and store the recipient list for execution Future transmission function

4. When the email does not arrive at the intended destination, send an automatic reply about non-delivery

Summary:The above is the entire content of this article , I hope it can be helpful to everyone’s study.

The above is the detailed content of What is MTA. For more information, please follow other related articles on the PHP Chinese website!