Geeksend Email Marketing: Understanding SMTP and IMAP protocols and their application scenarios

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In our daily use of email, SMTP and IMAP are two core communication protocols, which are responsible for sending and receiving emails respectively. Understanding the working principles and application scenarios of these protocols can help us better manage and use email services.



What is SMTP protocol?

Definition and working principle
SMTP (Simple Mail Transfer Protocol) is a protocol used to transfer emails between different computers. It is mainly used to transfer emails between email clients and email servers, and between different email servers.

The SMTP protocol follows the client-server model in the vietnam telegram number database communication process. Usually, when you send an email in an email client (such as Outlook, Thunderbird, etc.), the client uses the SMTP protocol to send the email to the specified email server, which then delivers the email to the recipient's email server.



Workflow

The workflow of the SMTP protocol is roughly as follows:
Establishing a connection: The mail client establishes a connection with the mail server through the SMTP protocol, usually using port 25, 465 or 587.
Sending mail: The client sends mail to the server, and after the server receives the mail, it confirms the recipient's address.
Delivering mail: If the recipient's mail server is different, the sender's mail server will deliver the mail to the recipient's mail server.
Confirming transmission: After the recipient's mail server receives the mail, it will confirm receipt of the mail to the sender's server, and the whole process is over.