[IMAP] What is the Kakao Mail IMAP/SMTP service?
IMAP/SMTP is a service that enables users to use Kakao Mail from a mobile and PC mail program.

You can check your emails from the mobile/PC mail program you were using without having to access Kakao Mail from a web browser.

IMAP syncs the activities in the mail program with the Kakao Mail web in real-time.

Emails are recorded as read if the email has been opened and as sent if the email has been sent from the mobile/PC email program.

In other words, IMAP provides users with the same email service experience in Kakao Mail web whenever you read or compose an email on an email program.