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SMTP servers work with other types of mail servers, namely POP3 or IMAP, to send emails from email clients. Copies of emails are left on the server until the user deletes them.Īn outgoing mail server operates by having a user's machine communicate with Simple Mail Transfer Protocol (SMTP), which handles the email delivery process. IMAP servers enable users to preview, delete and organize emails before transferring them to multiple devices from the email server. Many internet service providers offer their users POP3 email accounts, as they are more space efficient. Once the user downloads the email, it is automatically deleted from the server, unless the 'keep mail on server' setting is enabled. POP3, for example, downloads email from a server and stores incoming email messages on a single device until the user opens the email client. Post Office Protocol 3 ( POP3) and Internet Message Access Protocol (IMAP) are the two main types of incoming mail servers.

Mail servers can be divided into two categories: incoming mail servers and outgoing mail servers.Īn incoming mail server stores mail and sends it to a user's inbox. The mail server then forwards the message to either another mail server or to a holding area on the same server to be forwarded later. When an email is sent, a program, such as Microsoft Outlook, forwards the message to a mail server. A messaging system includes all the applications necessary to keep email moving smoothly. Microsoft Exchange, Exim and Sendmail are common examples of mail server programs.Ī mail server works with other programs to create a messaging system. A computer dedicated to running these applications is also called a mail server. Gillis, Technical Writer and EditorĪ mail server - also known as a mail transfer agent, or MTA mail transport agent mail router or internet mailer - is an application that receives incoming email from local users and remote senders and forwards outgoing messages for delivery.

Email servere are rejecting proton email