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Simple Mail Transport Protocol (SMTP) is a standards-based protocol used for transferring messages and is the primary mechanism that Internet-based and intranetbased e-mail servers use to transfer messages. It s also the mechanism that Outlook 2007 uses to connect to a mail server to send messages for an Internet account. SMTP is the protocol used by an Internet e-mail account for outgoing messages. SMTP operates by default on TCP port 25. When you con gure an Internet-based e-mail account, the port on which the server is listening for SMTP determines the outgoing mail server setting. Unless your e-mail server uses a different port (unlikely), you can use the default port value of 25. If you want to use Outlook 2007 for an existing Internet mail account, con rm the SMTP server name and port settings with your ISP. Post Of ce Protocol 3 (POP3) is a standards-based protocol that clients can use to retrieve messages from any mail server that supports POP3. This is the protocol that Outlook 2007 uses when retrieving messages from an Internet-based or intranet-based mail server that supports POP3 mailboxes. Nearly all ISP-based mail servers use POP3. Exchange Server also supports the use of POP3 for retrieving mail. POP3 operates on TCP port 110 by default. Unless your server uses a nonstandard port con guration, you can leave the port setting as is when de ning a POP3 mail account.
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To learn how to set up an Internet e-mail account for an SMTP/POP3 server, including setting port numbers, see Using Internet POP3 E-Mail Accounts in 7.
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Like POP3, Internet Message Access Protocol (IMAP) is a standards-based protocol that enables message transfer. However, IMAP offers some signi cant differences from POP3. For example, POP3 is primarily designed as an of ine protocol, which means that you retrieve your messages from a server and download them to your local message store (such as your local Outlook 2007 folders). IMAP is designed primarily as an online protocol, which allows a remote user to manipulate messages and message folders on the server without downloading them. This is particularly helpful for users who need to access the same remote mailbox from multiple locations, such as home and work, using different computers. Because the messages remain on the server, IMAP eliminates the need for message synchronization.
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IMAP by default leaves your messages on the server. If needed, you can con gure a POP3 account in Outlook 2007 to leave a copy of messages on the server, allowing you to retrieve those messages later from another computer. (To learn how to con gure a POP3 account, see Using Internet POP3 E-Mail Accounts in 7.) IMAP offers other advantages over POP3. For example, with IMAP, you can search for messages on the server using a variety of message attributes, such as sender, message size, or message header. IMAP also offers better support for attachments because it can separate attachments from the header and text portion of a message. This is particularly useful with multipart Multipurpose Internet Mail Extensions (MIME) messages, allowing you to read a message without downloading the attachments so that you can decide which attachments you want to retrieve. With POP3, the entire message must be downloaded.
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Security is another advantage of IMAP, because IMAP uses a challenge-response mechanism to authenticate the user for mailbox access. This prevents the user s password from being transmitted as clear text across the network, as it is with POP3. IMAP support in Outlook 2007 allows you to use Outlook 2007 as a client to an IMAPcompliant e-mail server. Although IMAP provides for server-side storage and the ability to create additional mail folders on the server, it does not offer some of the same features as Exchange Server or even POP3. For example, you can t store contact, calendar, or other nonmessage folders on the server. Also, special folders such as Sent Items, Drafts, and Deleted Items can t be stored on the IMAP server. Even with these limitations, however, IMAP serves as a exible protocol and surpasses POP3 in capability. Unless a competing standard appears in the future, it is possible that IMAP will eventually replace POP3. However, ISPs generally like POP3 because users e-mail is moved to their own computers, freeing space on the mail server and reducing disk space management problems. For that reason alone, don t look for IMAP to replace POP3 in the near future.
For information about other advantages and disadvantages of IMAP and how they affect Outlook 2007, see Using IMAP Accounts in 7. For additional technical information about IMAP, go to www.imap.org.
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