What is Esmtp?
ESMTP (Extended Simple Mail Transfer Protocol) specifies extensions to the original protocol for sending e-mail that supports graphics, audio and video files, and text in various national languages.
What is IMAP and POP3 ports?
IMAP and POP3 are the two most commonly used Internet mail protocols for retrieving emails. Both protocols are supported by all modern email clients and web servers. While the POP3 protocol assumes that your email is being accessed only from one application, IMAP allows simultaneous access by multiple clients.
What is Esmtp service?
Extended Simple Mail Transfer Protocol (ESMTP) defines an extension to the Simple Mail Transfer Protocol (SMTP) service whereby an SMTP client and server may interact to give the server an opportunity to decline to accept a message (perhaps temporarily) based on the client`s estimate of the message size.