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Customer experience | Sales, Customer Insights,...
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Dynamics Sales Emails Going Out in Old Winmail Format, Not HTML

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We have an issue where emails we are sending from inside Sales Hub with email templates are using the older Microsoft Transport Neutral Encapsulation Format (TNEF).
 
In non-MS mail clients, like Gmail, instead of showing the HTML, it shows the plain text version and a winmail.dat file attachment.
 
This looks bad to recipients, and the attachment can cause concern.
 
Is anyone else seeing this problem? Do you know how we can address it?
 
Using Outlook is not an option, as we are doing Sequences.
 
We have also checked Exchange and have no defaults that enable TNEF.
 
Thank you in advance.
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  • Suggested answer
    ManoVerse Profile Picture
    1,281 Super User 2026 Season 1 on at
    issue is typically caused by emails being sent in TNEF (winmail.dat) format, which is not supported by non-Microsoft clients like Gmail. Even if Exchange defaults are correct at your end, this can still occur due to:
    Email templates using rich text formatting which use TNEF , Server-side sync behavior in Sequences and  Remote domain or mailbox-level TNEF settings can cause this. 
    fix you can follow like below , reference link also there :
    1) ensure templates use HTML (not rich text)
    2) disable TNEF in Exchange (Set-RemoteDomain -TNEFEnabled $false) Command like below :
    Set-RemoteDomain Default -TNEFEnabled $false
    3)Avoid RTF in Dynamics email , in Email editor uses HTML format , No embedded RTF content
    Rebuild problematic templates from scratch if needed
     
    This should resolve your issue.

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