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Both protocols are also managed by the same mail server component, Cyrus, under Mac OS X Server. Virtually all email clients today support both POP and IMAP. However, the storage of all messages on the server also means that IMAP servers require more resources than POP servers. IMAP supports a wider range of authentication methods, making it a more secure protocol.

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IMAP also supports caching a copy of received messages on email clients for faster and offline access.

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This enables email clients on multiple computers (as well as web-based email clients) to be able to access the same mailbox and see the same series of messages and note which ones have been read.

The server also identifies messages that have been read. When an email client connects and authenticates to an IMAP server, mail can be read, but it remains stored on the server. IMAP manages email in a more hands-on approach.

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POP servers deal only with the download of received messages and do not keep track of whether the message has been read (a job left to the email clients). Typically, the message is then deleted from the server.

Email clients connect to a mail server using POP over TCP port 110, supply user credentials, and then transfer the message to the computer on which they are being run. Receipt of email is managed by one of two other email protocols: POP and IMAP. The message is then routed to the appropriate mail storage location, where it waits for the recipient to receive it. It then establishes a connection to that server and transmits the messages (again using the SMTP protocol). If need be, it queries a DNS server to determine the appropriate destination server and that serverвЂ™s IP address. The SMTP server (Postfix in this case) examines the recipient headers of the email. When an email is sent by an email application, it gets transmitted to the mail server by SMTP over port 25. Under Mac OS X Server, SMTP service is handled by the Postfix daemon. The SMTP protocol manages the process of send email. Configuration of the DNS records for a domain should be accomplished with your ISP or domain name registrar. Some ISPs will offer to allow you to use their mail servers as a backup server temporarily. A mail exchange record can actually specify multiple mail servers if you have a large organization and want to implement a backup mail server along with a value to identify the order in which each server should be used in the event that the first server cannot be contacted. The mail exchanger record tells other mail servers which server handles email for the domain. The address record includes the serverвЂ™s fully qualified domain name (that is, ) and its public IP address so that other mail servers (and email clients) can reach it. The DNS records for your domain name also need to include an address and mail exchanger (MX) record for your server. You can connect it to a DMZ or other external port on your firewall or router, or you can configure a port forwarding rule that forwards any communication from the Internet over the standard mail protocol TCP ports (25, 110, and 143) to your public IP address to the internal address of the server. Regardless of whether you are using private IP addressing and/or NAT to manage Internet connectivity for your organization, your mail server must have an IP address that is accessible to the Internet at large. Sending and receiving email through the Internet requires not only a server but also the proper DNS configuration. Properly configuring a mail server requires a basic understanding of how email as a whole functions. They would be under any other Unix or Linux operating system. They can also be managed from the command line as Graphical interface and has also included some interaction between these toolsДЄnd Open Directory to allow you to manage email accounts as part of general Mac Apple has integrated these tools into the Server Admin However, in Mac OS X ServerДЎ0.3, Apple dropped this earlier email platform in favor of a series of open (AppleвЂ™s classic Mac OS server platform). The original mail service wasДeveloped by Apple based on the email server included with AppleShare IP Series of changes over the past few years.

Mail services under Mac OS X Server have actually gone through an interesting Some of the advanced configuration that can be done from the command line. It focuses on configuration basics using Server Admin and

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This series discusses the basics of how to configure Mac OS X ServerДЄs an email server. Have been removed from the Apple Mac OS X Server Essentials course curriculumДЄnd exam. Often discussed when talking about server management. How to configure the Mac OS X Server mail services is a topic that is not Mac OS X Server 10.4 Tiger: Visual QuickPro Guide

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