Exchange Online 中的郵件格式和傳輸Message format and transmission in Exchange Online

有 Outlook、 在 web 上的 Outlook 和 Exchange Online 中設定該控制項的電子郵件格式和如何傳送給其他網域的人。在大多數情況下運作的預設設定。如果特定收件者無法閱讀從您的組織傳送的郵件,您可以調整為個別使用者或特定的網域上的所有使用者的設定。例如,您可以防止收件者收到 winmail.dat 附件。There are settings in Outlook, Outlook on the web, and Exchange Online that control the format of email messages and how they are sent to people on other domains. The default settings work in most cases. If specific recipients have trouble reading messages sent from your organization, you can adjust the settings for individual users, or for all users on a specific domain. For example, you can prevent recipients from receiving a winmail.dat attachment.

您可以使用兩種設定:There are two types of settings you can use:

  • 郵件格式。使用者建立郵件時可以選擇使用何種郵件格式來撰寫郵件。在 Outlook 中,他們可以選擇純文字、HTML 或 RTF 格式。在 Outlook Web App 中,他們可以選擇純文字或 HTML。Message format. When a user creates a message, they can choose the message format in which to author the message. In Outlook, they have a choice between plain text, HTML, and rich-text format. In Outlook Web App they have a choice between plain text and HTML.

  • 郵件傳輸。這代表郵件實際上如何傳送至其他電子郵件系統。Exchange 可以利用多用途網際網路郵件延伸標準 (MIME) 或 Transport Neutral Encapsulation Format (TNEF),將郵件傳送至其他網域。這三種郵件格式都可以使用 TNEF 來傳送。只有 HTML 和純文字可以使用 MIME 來傳送。管理員可以針對每個網域或每個收件者來設定郵件傳輸格式,而使用者也可以指定郵件傳輸格式。Message transmission. This means how the message is actually sent to the other email system. Exchange can send messages to other domains by using Multipurpose Internet Mail Extensions (MIME) or Transport Neutral Encapsulation Format (TNEF). All three message formats can be sent using TNEF. Only HTML and plain text can be sent using MIME. Message transmission format can be set by an admin per domain or per recipient, and users can also specify message transmission format.

郵件格式Message formats

下列清單說明 Exchange Online 中可用的三種郵件格式,並顯示 Outlook 和 Outlook Web App 中可用的郵件格式:The following list describes the three message formats available in Exchange Online, and shows which ones are available in Outlook and Outlook Web App:

格式Format 描述Description 在 Outlook 中可用Available in Outlook 可在 web 上的 OutlookAvailable in Outlook on the web
純文字Plain text
純文字郵件只使用 US-ASCII 文字,如 RFC 2822 所述。郵件不能包含不同字型或其他文字格式。A plain text message uses only US-ASCII text as described in RFC 2822. The message can't contain different fonts or other text formatting.
Yes
Yes
HTMLHTML
HTML 郵件支援文字格式、背景影像、表格、項目符號及其他圖形元素。An HTML message supports text formatting, background images, tables, bullet points, and other graphical elements.
Yes
Yes
RTF 格式 (RTF)Rich text format (RTF)
RTF 支援文字格式及其他圖形元素。RTF supports text formatting and other graphical elements.
Outlook、 Outlook Web App 和少數其他 MAPI 電子郵件用戶端判讀 RTF 郵件。Only Outlook, Outlook Web App, and a few other MAPI email clients understand RTF messages.
Yes
可以讀取郵件格式的 RTF,但無法格式化或傳送此格式Can read messages formatted in RTF, but can't format or send this format

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傳送至外部收件者之郵件的郵件傳輸格式Message transmission formats for mail sent to external recipients

下表說明 Exchange Online 用來將電子郵件傳送至外部收件者的郵件傳輸格式。The following table describes the message transmission formats that Exchange Online uses to send email messages to external recipients.

傳輸格式Transmission format 描述Description
Transport Neutral Encapsulation Format (TNEF)Transport Neutral Encapsulation Format (TNEF)
TNEF 是 Microsoft 用來傳輸格式化電子郵件的專用格式。TNEF 郵件包含一個純文字版的郵件,以及一個包裝原始格式版本郵件的附件。此附件通常命名為 Winmail.dat。Winmail.dat 附件包含格式化、附件和 Outlook 專用功能,例如會議邀請。TNEF is a Microsoft-specific format for transmitting formatted email messages. A TNEF message contains a plain text version of the message and an attachment that packages the original formatted version of the message. Typically, this attachment is named Winmail.dat. The Winmail.dat attachment includes formatting, attachments, and Outlook-specific features such as meeting requests.
完全了解 TNEF,例如 Outlook 的電子郵件用戶端處理 Winmail.dat 附件,並顯示原始郵件內容不屬於顯示 Winmail.dat 附件。不支援 tnef 的電子郵件用戶端可能會造成 TNEF 郵件任何下列兩種:An email client that fully understands TNEF, such as Outlook, processes the Winmail.dat attachment and displays the original message content without ever displaying the Winmail.dat attachment. An email client that doesn't understand TNEF may present a TNEF message in any of the following ways:
會顯示訊息的純文字版本、 與郵件包含名為 Winmail.dat、 Win.dat、 或一些其他一般名稱如 Att nnnnn.dat 或 Att nnnnn.eml 其中_nnnnn_版面配置區代表隨機的附件數字。The plain text version of the message is displayed, and the message contains an attachment named Winmail.dat, Win.dat, or some other generic name such as Att nnnnn.dat or Att nnnnn.eml where the nnnnn placeholder represents a random number.
顯示純文字版的郵件。忽略或移除 TNEF 附件。結果為純文字郵件。The plain text version of the message is displayed. The TNEF attachment is ignored or removed. The result is a plain text message.
有協力廠商公用程式可以協助轉換 Winmail.dat 附件。There are third-party utilities that can help convert Winmail.dat attachments.
多用途網際網路郵件延伸標準 (MIME)Multipurpose Internet Mail Extensions (MIME)
MIME 是一項網際網路標準,支援非 ASCII 字元集的文字、非文字附件、含多部分的郵件內文,以及非 ASCII 字元集的標頭資訊。MIME is an Internet standard that supports text in character sets other than ASCII, non-text attachments, message bodies with multiple parts, and header information in non-ASCII character sets.

郵件格式和傳輸設定Message format and transmission settings

管理員和使用者可以控制郵件格式及傳輸。管理員設定會覆寫使用者設定。Admins and users can control message formatting and transmission. Admin settings override user settings.

管理員可以控制下列設定:Admins can control the following settings:

  • 遠端網域設定 遠端網域設定可控制傳送至遠端網域的人的郵件格式。您可以針對特定外部網域或所有外部網域來控制格式。如需遠端網域的相關資訊,請參閱 Exchange Online 中的遠端網域。遠端網域設定會覆寫由管理員或使用者所設定的個別使用者設定。Remote domain settings Remote domain settings control the format of messages sent to people on the remote domain. You can control the format for a specific external domain, or for all external domains. For more information about remote domains, see Remote domains in Exchange Online. The remote domain settings override the per-user settings set by admins or users.

  • 郵件使用者和郵件連絡人設定您可以透過變更特定的郵件使用者或郵件連絡人設定變更為個別的收件者的設定。郵件使用者和郵件連絡人是類似因為兩者有外部電子郵件地址包含在 Exchange Online 組織外部人員的相關資訊。主要差異在於郵件使用者具有可用來登入 Exchange Online 組織的使用者識別碼。當系統管理員變更的每個收件者設定時,它會覆寫該收件者的使用者設定的設定。如需系統管理設定的詳細資訊,請參閱管理郵件使用者管理郵件連絡人Mail user and mail contact settings You can change settings for individual recipients by changing settings for specific mail users or mail contacts. Mail users and mail contacts are similar because both have external email addresses and contain information about people outside the Exchange Online organization. The main difference is mail users have user IDs that can be used to sign in to the Exchange Online organization. When an admin changes a per-recipient setting, it overrides settings that a user sets for that recipient. For more information about the admin settings, see Manage mail users and Manage mail contacts.

使用者可以控制下列設定:Users can control the following settings:

  • Outlook 設定 在 Outlook 中,可讓您設定郵件的格式和編碼選項,如下列清單所述:Outlook settings In Outlook, you can set the message formatting and encoding options described in the following list:

    • 郵件格式您可以為所有郵件設定預設郵件格式。在撰寫特定郵件時,也可以覆寫預設郵件格式。Message format You can set the default message format for all messages. You can override the default message format as you compose a specific message.

    • 網際網路郵件格式您可以控制是否將 TNEF 郵件傳送給遠端收件者,或是否要先轉換為更相容的格式。對於傳送給遠端收件者的郵件,您也可以指定各種郵件編碼選項。對於傳送給 Exchange Online 組織中收件者的郵件,這些設定則不適用。Internet message format You can control whether TNEF messages are sent to remote recipients or whether they are first converted to a more compatible format. You can also specify various message encoding options for messages sent to remote recipients. These settings don't apply to messages sent to recipients in the Exchange Online organization.

    • 網際網路收件者郵件格式您可以控制是否將 TNEF 郵件傳送給特定收件者,或是否要先轉換為更相容的格式。您可以為 [連絡人] 資料夾中的特定連絡人設定選項,也可以在撰寫郵件時,針對 [收件者]、[副本] 或 [密件副本] 欄位中的特定收件者來覆寫這些選項。這些選項不適用於 Exchange Online 組織中的收件者。Internet recipient message format You can control whether TNEF messages are sent to specific recipients or whether they are first converted to a more compatible format. You can set the options for specific contacts in your Contacts folder, and you can override these options for a specific recipient in the To, Cc, or Bcc fields as you compose a message. These options aren't available for recipients in the Exchange Online organization.

    • 網際網路收件者郵件編碼選項 您可以為 [連絡人] 資料夾中的特定連絡人設定 MIME 或純文字編碼選項,也可以在撰寫郵件時,針對 [收件者]、[副本] 或 [密件副本] 欄位中的特定收件者來覆寫這些選項。這些選項不適用於 Exchange Online 組織中的收件者。Internet recipient message encoding options You can control the MIME or plain text encoding options for specific contacts in your Contacts folder, and you can override these options for a specific recipient in the To, Cc, or Bcc fields as you compose a message. These options aren't available for recipients in the Exchange Online organization.

    • 國際選項您可以控制郵件使用的字元集。International options You can control the character sets used in messages.

      如需 Outlook 設定的詳細資訊,請參閱<在 Outlook 中變更郵件格式>。For more information about Outlook settings, see Change the message format in Outlook.

  • Outlook Web App/Outlook 在網站設定您可以設定的郵件格式下列清單所述的選項:Outlook Web App/Outlook on the web settings You can set the message formatting options described in the following list:

    • 郵件格式您可以為所有郵件設定預設郵件格式。在撰寫特定郵件時,也可以覆寫預設郵件格式。Message format You can set the default message format for all messages. You can override the default message format as you compose a specific message.

      如需 Outlook Web App 設定的詳細資訊,請參閱<在 Outlook Web App 中建立及回覆郵件>。For more information on Outlook Web App settings, see Create and respond to messages in Outlook Web App.

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