By default, when you send a rich-text message using the Microsoft ExchangeInternet Mail Provider, a MIME-encoded description of the formatting isincluded with the message. You can also send messages without MIME; thiscauses a special file to be attached called Winmail.dat. Winmail.datisappended to the message in uuencoded format. This encoding includes rich-text attributes and formatting details for the mail message.
For additional information about how to prevent sending the Winmail.dat attachment to Internet users when you are using the Microsoft Exchange Internet Mail Service, click the article number below to view the article in the Microsoft Knowledge Base:
XFOR: Preventing WINMAIL.DAT Sent to Internet Users
When a rich-text format message is sent using MIME, an entry similar tothefollowing is added to the header of the message:
Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="---- =_NextPart_000_01BA6275.348C1000" Status: RO X-STATUS====== ------ =_NextPart_000_01BA6275.348C1000 ------ =_NextPart_000_01BA6275.348C1000 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit
Following the header is the message body, followed by MIME-encoded rich-text formatting information similar to the following:
------ =_NextPart_000_01BA6275.348C1000 Content-Type: application/ms-tnef Content-Transfer-Encoding: base64 eJ8+IisSAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAENgAQAAgAAAAEAAQ ABBJAGAEgBAAABAAAADAAAAAMAADACAAAACwAPDgAAAAACAf8PAQAAAHQAAAAAAAAAtTvC wCx3EBqhvAgAKypWwhUAAAB2ZPLzl7rOEa5RAKoAQkrnpIAAAAAAAACBKx+kvqMQGZ1uAN 0BD1QCAAAAAEdyZWcgS3VkYXN6IChhdCBjcmlzLmNvbSkAU01UUABna3VkYXN6QGNyaXMu Y29tAB4AAjABAAAABQAAAFNNVFAAAAAAHgADMAEAAAARAAAAZ2t1ZGFzekBjcmlzLmNvbQ AAAAADABUMAQAAAAMA/g8GAAAAHgABMAEAAAAcAAAAJ0dyZWcgS3VkYXN6IChhdCBjcmlz LmNvbSknAAIBCzABAAAAFgAAAFNNVFA6R0tV [. . .]
Alternatively, when a rich-text formatted message is sent using UUENCODE,code similar to the following is added to the bottom of the message:
begin 600 WINMAIL.DAT M>)\^(C<.`0:0" `$```````!``$``0>0!@`(````Y 0```````#H``$%@ ,` M#@```,L'" `$``<`)P`O``4`0 $!"8 !`"$````S,S5$,C,W,#%"0T-#13$Q M04,S,C4R-#$U,S0X,# P,0#8!@$@@ ,`#@```,L'" `$``<`)P`V``4`1P$! M"( '`!@```!)4$TN36EC<F]S;V9T($UA:6PN3F]T90`Q" $$@ $`& ```%MS M;71P.F=K=61A<WI 8W)I<RYC;VU=``T)`0V ! `"`````@`"``$#D 8```$` M``P```! `#D`X!.6)7ABN@$>`' ``0```!@```!;<VUT<#IG:W5D87-Z0&-R [. . .]
Note that the MIME encoding and WINMAIL.DAT information are not legibletext. Only Microsoft Exchange and messaging systems compatible with rich-text formatting can translate the formatting details contained in the MIMEencoding and in WINMAIL.DAT.
TOGGLING RICH-TEXT FORMAT
The following scenarios outline when a message sent though the Internet with Microsoft Exchange is delivered in rich-text format.NOTE
: The following examples are true for the Microsoft Exchange Internet Provider that ships with Microsoft Plus! for Windows 95. Other providers may have different defaults.
New Address Book Entry
Rich text is a property that can be set per recipient with the InternetMail Provider. You can set the rich-text option in the personal addressbook by clicking New Entry
from the Address Book File
menu, and clickingInternet Address
. By default, rich-text formatting is off for new entries.
Adding Address Book Entry from Message
If you receive mail from a sender that is not in your personal addressbook, you can add that person by examining the details on that sender(double-click the sender's alias name in the From
box), and clicking Add To: Personal Address Book
. The new entry has rich-textformatting off by default for the alias you are creating.
You can click to select the Always Send To This Recipient In MicrosoftExchange Rich-Text Format
check box to turn on rich-text formatting forthenew alias. This setting is used when you choose the name from theaddress book for both of the above examples.NOTE
: The above two examples are true for the Microsoft Exchange InternetProvider that ships with Microsoft Plus! for Windows 95. Other providersmay have different defaults.
Entering Address in [smtp:email@example.com] Format
Instead of choosing an alias from the personal address book, you can useone of two forms of "one-off addressing." One-off addressing allows you toenter an alias directly in the To
box when you compose a message.
The first form of one-off addressing is to type the address enclosed inbrackets with the SMTP address designator. Messages addressed in thisformat are delivered in rich-text format.
Entering Address in firstname.lastname@example.org Format
The second form of one-off addressing is to enter the address withoutenclosing the address in brackets. Messages addressed in this format areNOT delivered in rich-text format.
: For the above two examples, you can toggle the rich-text settingusing the following steps:
- Click Check Names on the toolbar, or press CTRL+K.
- Double-click the alias name in the To box.
- Either click to select or click to clear the Always Send To This Recipient In Microsoft Exchange Rich-Text Format check box, as applicable.