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Email send to contact becomes plain text automatically RRS feed

  • Question

  • Hi all,

    We have hybrid office 365 environment - on-premise AD integrates with Office 365.

    We have contacts created in the AD and they syncs to exchange online. 

    Say our domain is internal.com

    Say user1@external.com is their email address in the contact

    As the user1 needs an email address to receive emails from our domain, so I created the user1 as the "Mail user" in the contact which will give user1 the email address user1@internal.com, but the primary SMTP address is still user1@external.com

    Any emails sent to user1@internal.com will be delivered to user1@external.com

    All works well except 

    * when we sending rich text email to user1@external.com - It will become plain text email automatically

    * when we were sending a rich text email to user1@internal.com, email displays fine.

    This happens to all the users with this setting

    Can anyone shed light on this issue?

    Thanks!


    Monday, December 19, 2016 3:17 AM

All replies

  • Hi,

    Does this issue happen to all external emails addresses in the @external.com domain?

    What email client are you using when the external user tries to view the email sent in Rich Text format? Exchange can send messages to other domains by using Transport Neutral Encapsulation Format (TNEF). A TNEF message contains a plain text version of the message and an attachment that packages the original formatted version of the message. An email client that doesn't understand TNEF may present a TNEF message in Plain Text format. See the following article for more information:

    https://technet.microsoft.com/en-us/library/jj983438%28v=exchg.150%29.aspx

    In addition, admins and users can also control message formatting. You can see detailed information in above article (see "Message format and transmission settings" section). Make sure the settings are set correctly by both admins and users.

    Regards,

    Steve Fan


    Please remember to mark the replies as answers if they helped.

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    Tuesday, December 20, 2016 7:41 AM
  • Hi Steve,

    Thanks for your reply.

    The external uses outlook as the email client.

    Upon reading the article about the remote domain. I've added the external as the remote domain. I will do a couple of <g class="gr_ gr_183 gr-alert gr_gramm gr_run_anim Grammar multiReplace" data-gr-id="183" id="183">test</g> and then come back.

    Thank you

    Wednesday, December 21, 2016 1:43 AM
  • Hello,

    Any update on this issue? Please don't hesitate to post back if you need further assistance.

    Regards,

    Steve Fan


    Please remember to mark the replies as answers if they helped.

    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Friday, December 23, 2016 8:06 AM
  • Hi Steve,

    Unfortunately still no luck as the external organization is not using a exchange server.

    Issue still the same. We've checked the outlook trust center settings but no luck.

    Thank you

    Tuesday, December 27, 2016 10:10 PM
  • Have you tried to connect to Exchange Online using Powershell and set the -UseMapiRichTextFormat to Always for a specific mail contact?  If their server can't interpret this format it will result in Winmail.dat attachment.

    Set-MailContact -Identity user@example.com -UseMapiRichTextFormat Always



    Friday, December 30, 2016 5:26 PM