How to make sure HTML is not stripped from outgoing mails RRS feed

  • Question

  • Hi

    We migrated recently to EXO from EX2010. The sister company is using Google Suite (no comment on this please).

    Some usual contacts in that sister company are now complaining they are receiving emails in text form, i.e. with the HTML layout stripped.

    My guess is that it is because of some "mail protection" tool which is overacting. Snice it did not happen when we were using Exchange 2010, my first suspect is Exchange Online Protection acting on our outgoing mails.
    I have even noticed that some hyperlinks were removed on the outgoing copy I got through journaling when mails were sent to them, while such hyperlinks are not removed when mails are exchanged within our domain.

    However I do not know how (or even if it is possible) to "whitelist" the domain of our sister company, to soften the rules and to preserve more useful content (even if it means a looser protection against infected or rogue computers within my users.)



    Friday, February 7, 2020 5:22 PM


All replies

  • You may want to try disabling TNEF and making sure the sister company domain isn't set to use a different formatting system (get-remotedomain <domain> will let you see this in Office 365 Powershell) explains TNEF

    Adam Brown


    Blog: AC Brown's IT World

    Catapult Systems

    Friday, February 7, 2020 5:45 PM
  • Hi,

    Do suggestions above help? If you have any questions or needed further help on this issue, please feel free to post back. If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well.


    Joyce Shen

    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact

    Wednesday, February 12, 2020 1:57 AM
  • Thanks Adam. TNEF was indeed the culprit. <insert-rant-about-TNEF-here/>
    Tuesday, February 18, 2020 4:16 PM