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Hosting Email On Web Server - How Does This Work? Email Hosting is one of the most crucial decisions you need to take about your organisation. The term ‘Email Server' itself denotes two varied aspects of email hosting: (1) Hardware server whereon emails are handled in a dedicated email server, and (2) Software on the server used to handle emails in a dedicated email server or in a server performing another function, like a web server. Emails are becoming increasingly important a business communication tool amongst business organisations and individuals today and hence, its reliability. Email servers (or mail servers) enable you to send or receive emails. Bundled with internal & external web servers, email servers facilitate the receipt, distribution and relay of emails. Email host comprises two special computers, SMTP (or Simple Mail Transfer Protocol) server and POP3 server, where POP refers to Post Office Protocol. The former listens on a standard port 25 for email transmission and the latter listens on port 110. Here is how Email Hosting works on a Web Server: • Say, you want to send an email to ‘John'; you have a Yahoo account with the name as ‘Morningdew'. You set up an email client with the mail server name as ‘mail.yahoo.com'. When you direct your message to John having an account with say, AOL, his server name will be ‘mail.aol.com', the email client will connect to the mail server using port 25. • The next step will have the client telling the address of the sender and the receiver to the SMTP server, with the body containing your message. • The SMTP server would next take the ‘To' address () and break down the address to the recipient's name (John) and the domain name (aol.com). • Then the SMTP server would communicate with the DNS (Domain Name Server) to find the server or location for the host of the destined mail. The DNS supplies the desired information. • Lastly, the SMTP connects with the SMTP server at mail.aol.com to send the received information from the DNS to that mail server. Once received, the SMTP server then forwards the message to the POP server and it in turn puts the message into John's mailbox.
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