There are two different protocols available to access e-mail: POP3 and IMAP. POP3 is useful when e-mail is checked from only one computer. IMAP is the better choice when you would like to check your mail from multiple computers, at work and home, for example. IMAP has the added benefit of accessing folders on the server, allowing you to organize your e-mail, and access it from anywhere. If you use Webmail, you should use IMAP on all of your e-mail clients. Use of a POP3 mail client in association with Webmail can cause errors in your inbox that will result in a temporary loss of access to your mail.

The Difference
POP3 works by reviewing the inbox on the mail server, and downloading the new messages to your computer. IMAP downloads the headers of the new messages on the server, then retrieves the message you want to read when you click on it.

When using POP3, your mail is stored on your PC. When using IMAP, the mail is stored on the mail server. Unless you copy a message to a “Local Folder” the messages are never copied to your PC.

Scenarios of Use

POP3

Organize your mail into folders, and archive your older messages. This speeds e-mail retrieval by minimizing the number of messages in the inbox.

Errors caused by using POP3 and Webmail
When used in conjunction with a permanent e-mail client, Webmail can be a useful way to check and send messages while you are away from your computer. However, if there is a POP3 e-mail client automatically checking your mail every so many minutes, and you are also accessing Webmail from another location, there is the possibility that your mailbox will become corrupt. It will appear as if your mailbox is empty in Webmail, and your mail client will deny you access to your messages. You mailbox can be restored by simply calling the Help Desk; there is no reason to become alarmed. This can be avoided by setting your mail client to use IMAP.

Submitted by Sylvester Garcia

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