POP3 及 IMAP4POP3 and IMAP4

摘要: POP3 和 IMAP4 及兩者之間差異的概觀。Summary: An overview of POP3 and IMAP4, and the differences between them.

根據預設,POP3 和 IMAP4 已啟用 Exchange Online 中的所有使用者。By default, POP3 and IMAP4 are enabled for all users in Exchange Online.

使用者可以使用任何支援 POP3 和 IMAP4 的電子郵件程式來連線至 Exchange Online。這些程式包括 Outlook、Microsoft Outlook Express、Entourage 與協力廠商程式,如 Mozilla Thunderbird 和 Eudora。每個電子郵件用戶端程式所支援的功能各不相同。如需特定 POP3 和 IMAP4 用戶端程式提供之功能的相關資訊,請參閱每個應用程式內含的文件。Users can use any email programs that support POP3 and IMAP4 to connect to Exchange Online. These programs include Outlook, Microsoft Outlook Express, Entourage, and many third-party programs, such as Mozilla Thunderbird and Eudora. The features supported by each email client programs vary. For information about features offered by specific POP3 and IMAP4 client programs, see the documentation that's included with each application.

POP3 和 IMAP4 提供的 Exchange Online 的基本的電子郵件功能的存取和允許存取離線電子郵件,但未提供豐富的電子郵件、 行事曆,以及連絡人管理、 或時可使用的使用者連線 Outlook、 Exchange 與其他功能ActiveSync、 Outlook Web App 或 Outlook 語音存取。POP3 and IMAP4 provide access to the basic email features of Exchange Online and allow for offline email access, but don't offer rich email, calendaring, and contact management, or other features that are available when users connect with Outlook, Exchange ActiveSync, Outlook Web App, or Outlook Voice Access.

注意

每次使用者存取 POP 或 IMAP 電子郵件程式以開啟 Office 365 電子郵件時,都會感覺到幾秒鐘的延遲。延遲是因為使用 Proxy 伺服器,而產生額外的驗證用躍點。Proxy 伺服器會先查看指派的 pod 伺服器 (用戶端存取伺服器),然後對其進行驗證。Each time a person accesses a POP-based or IMAP-based email program to open his or her Office 365 email, that user will experience a delay of several seconds. The delay results from using a proxy server, which introduces an additional hop for authentication. The proxy server first looks up the assigned pod server (client access server) and then authenticates against that.

使用者用來設定其 Exchange Online 信箱之 POP3 或 IMAP4 存取的設定Settings users use to set up POP3 or IMAP4 access to their Exchange Online mailboxes

啟用 POP3 與 IMAP4 用戶端存取功能之後,必須提供使用者下表中的資訊,以便將其電子郵件程式連線至 Exchange Online 信箱。After you enable POP3 and IMAP4 client access, you have to give users the information in the following table so that they can connect their email programs to their Exchange Online mailboxes.

POP3 與 IMAP4 電子郵件程式不使用 POP3 與 IMAP4 將郵件傳送到電子郵件伺服器。使用 POP3 與 IMAP4 的電子郵件程式依賴 SMTP 傳送郵件。POP3 and IMAP4 email programs don't use POP3 and IMAP4 to send messages to the email server. Email programs that use POP3 and IMAP4 rely on SMTP to send messages.

伺服器名稱Server name
PortPort
加密方法Encryption method
POP3POP3
Outlook.office365.comOutlook.office365.com
995995
TLSTLS
IMAP4IMAP4
Outlook.office365.comOutlook.office365.com
993993
TLSTLS
SMTPSMTP
Smtp.office365.comSmtp.office365.com
587587
TLSTLS

了解 POP3 和 IMAP4 之間的差異Understanding the differences between POP3 and IMAP4

當 POP3 電子郵件程式將電子郵件下載至用戶端電腦時,預設會從伺服器移除下載的郵件。當使用者的電子郵件副本未保留在電子郵件伺服器時,使用者就無法從多部電腦存取相同的電子郵件。不過,部分 POP3 電子郵件程式可以設定成將郵件的副本保留在伺服器上,這樣就可以從另一部電腦存取相同的電子郵件。POP3 用戶端程式只可以用來將郵件從電子郵件伺服器下載至用戶端電腦的單一資料夾 (通常是「收件匣」)。POP3 無法將電子郵件伺服器上的多個資料夾與用戶端電腦的多個資料夾進行同步處理。POP3 也不支援公用資料夾存取功能。By default, when POP3 email programs download email messages to a client computer, the downloaded messages are removed from the server. When a copy of your user's email isn't kept on the email server, the user can't access the same email messages from multiple computers. However, some POP3 email programs can be configured to keep copies of the messages on the server so that the same email messages can be accessed from another computer. POP3 client programs can be used to download messages from the email server to only a single folder (usually, the Inbox) on the client computer. POP3 can't synchronize multiple folders on the email server with multiple folders on the client computer. POP3 also doesn't support public folder access.

POP3 所使用的電子郵件用戶端使用 IMAP4 的程式具有更彈性和通常提供以外的更多功能。根據預設,當 IMAP4 電子郵件程式電子郵件訊息下載至用戶端電腦,每個複本會下載電子郵件伺服器上的郵件保留原狀。因為使用者的電子郵件訊息的複本會保留在電子郵件伺服器上,使用者可以存取相同的電子郵件訊息從多部電腦。使用 IMAP4 電子郵件使用者可以存取及電子郵件伺服器上建立多個電子郵件資料夾。使用者接著可以存取其郵件之伺服器上的任何從多個位置中的電腦。例如,大部分的 IMAP4 程式可以設定為伺服器上保留一份使用者傳送的項目,讓他就可以檢視已傳送的項目從任何其他電腦。IMAP4 支援大部分的 IMAP4 程式所支援的其他功能。例如,某些 IMAP4 程式包含可讓使用者可以檢視伺服器上只有其電子郵件標頭的功能 — 屬於從郵件和主旨 — 然後再下載他們想要讀取的郵件。Email client programs that use IMAP4 are more flexible and generally offer more features than those that use POP3. By default, when IMAP4 email programs download email messages to a client computer, a copy of each downloaded message remains on the email server. Because a copy of the user's email message is kept on the email server, the user can access the same email message from multiple computers. With IMAP4 email, the user can access and create multiple email folders on the email server. Users can then access any of their messages on the server from computers in multiple locations. For example, most IMAP4 programs can be configured to keep a copy of a user's sent items on the server so that he or she can view the sent items from any other computer. IMAP4 supports additional features that are supported by most IMAP4 programs. For example, some IMAP4 programs include a feature that lets users view only the headers of their email messages on the server—who the messages are from and the subjects—and then download only the messages that they want to read.

POP3 與 IMAP4 電子郵件程式的傳送和接收選項Send and receive options for POP3 and IMAP4 email programs

POP3 和 IMAP4 電子郵件程式可讓使用者選擇想要連線至伺服器以傳送和接收電子郵件的時間。本節討論一些最常用的連線選項,並提供使用者在選擇其 POP3 和 IMAP4 電子郵件程式的可用連線選項時應該考慮的一些因素。POP3 and IMAP4 email programs let users choose when they want to connect to the server to send and receive email. This section discusses some of the most common connectivity options and provides some factors your users should consider when they choose connection options available in their POP3 and IMAP4 email programs.

一般組態設定Common configuration settings

您可以在 POP3 或 IMAP4 用戶端應用程式上設定的三個最常用連線設定如下:Three of the most common connection settings that can be set on the POP3 or IMAP4 client application are:

  • 在每次啟動電子郵件應用程式時傳送和接收郵件。使用此選項時,只會在啟動電子郵件應用程式時傳送和接收郵件。To send and receive messages every time the email application is started. When this option is used, mail is sent and received only on starting the email application.

  • 手動傳送和接收郵件。使用此選項時,只會在使用者按一下用戶端使用者介面中的 [傳送及接收] 選項時才會傳送和接收郵件。To send and receive messages manually. When this option is used, messages are sent and received only when the user clicks a send-and-receive option in the client user interface.

  • 在每隔設定的分鐘數之後傳送和接收郵件。使用此選項時,用戶端應用程式會在每隔設定的分鐘數之後連線至伺服器,以傳送郵件和下載所有新的郵件。To send and receive messages every set number of minutes. When this option is used, the client application connects to the server every set number of minutes to send messages and download any new messages.

如需如何設定所使用電子郵件應用程式之這些設定的相關資訊,請參閱電子郵件應用程式提供的說明文件。For information about how to configure these settings for the email application that you use, see the Help documentation that's provided with the email application.

選取傳送及接收選項時的考量Considerations when selecting send and receive options

某些電子郵件程式上的預設值,並非設為當您擷取郵件之後,會將副本保留在伺服器。如果使用者想要透過多個電子郵件程式或裝置存取郵件,則應在伺服器上保留郵件副本。The default setting on some email programs is to not keep a copy of messages on the server after they're retrieved. If the user wants to access messages from multiple email programs or devices, they should keep a copy of messages on the server.

如果執行 POP3 或 IMAP4 電子郵件應用程式的裝置或電腦一律會連線至網際網路,則使用者可能會想要設定電子郵件應用程式在每隔設定的分鐘數之後傳送和接收郵件。以頻繁間隔連線至伺服器可讓使用者的電子郵件應用程式具有伺服器上的最新資訊。不過,如果執行 POP3 或 IMAP4 電子郵件應用程式的裝置或電腦不一定會連線至網際網路,則使用者可能會想要設定電子郵件應用程式手動傳送和接收郵件。If the device or computer that's running the POP3 or IMAP4 email application is always connected to the Internet, the user might want to configure the email application to send and receive messages every set number of minutes. Connecting to the server at frequent intervals lets the user keep the email application up-to-date with the most current information on the server. However, if the device or computer that's running the POP3 or IMAP4 email application isn't always connected to the Internet, the user might want to configure the email application to send and receive messages manually.

注意

如果使用者使用支援 IMAP4 IDLE 命令的 IMAP4 相容電子郵件應用程式,則使用者可能可以用接近即時的方式將電子郵件傳送至 Exchange 信箱,以及接收來自該信箱的電子郵件。若要讓此連線方法運作,則電子郵件伺服器應用程式和用戶端應用程式必須支援 IMAP4 IDLE 命令。在大部分情況下,使用者不需要在其 IMAP4 程式中進行任何設定,就可以使用此連線方法。If the user is using an IMAP4-compliant email application that supports the IMAP4 IDLE command, the user might be able to send email to and receive email from the Exchange mailbox in nearly real time. For this connection method to work, both the email server application and the client application must support the IMAP4 IDLE command. In most cases, users don't have to configure any settings in their IMAP4 programs to use this connection method.