This varies by the operating system used to run the mail server. In Linux, typically there are separate service daemons (servers) for each protocol. A popular SMTP server for receiving mail (from local users to go out, or from other domains coming in) is Postfix. A popular POP3/IMAP server is Dovecot. But if you ask different people you may get different answers based on their unique setup.
Microsoft Exchange Server
-Google mail -Yahoo Mail -Hotmail
yes i find email address by search in Google.com
Mail servers can broadly be divided in incoming mail servers (POP3 and IMAP) and outgoing mail servers (SMTP). The most popular and well known mail servers are sendmail, Microsoft Exchange Server, Postfix and Exim.
Incoming server can refer to the mail server your mail client accesses for email.
(Mail Client Server) e-mail client is also used to refer to any agent acting as a client toward an e-mail server,
Outgoing mail server (SMTP): smtp.charter.net
The primary uses of a mail server are to send and receive messages for its users.
Incoming mail server settings:POP server: pop.mail.yahoo.comUse SSLPort: 995Outgoing mail server (SMTP) settings:SMTP server: smtp.mail.yahoo.comUse SSLPort: 465Use authentication
Hotmail's incoming mail server for POP3 is pop3.live.com on port 995. Hotmail's incoming mail server for IMAPis imap-mail.live.com on port 993.
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Your incoming POP3 mail server is "mail.comcast.net" Your outgoing SMTP mail server is "smtp.comcast.net" Guides for various external mail clients can be found: http://www.comcast.net/help/faq/index.jsp?cat=Email#More___