Winmail. dat - HELP

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Outlook version
Outlook 2013 64 bit
Email Account
Hi, this is my problem:

Some of my customers (not all) complain that they only receive a winmail.dat file instead of the attachment. I understand that its because Outlook is sending the files as 'rich text' but I can't seem to fix it.

Heres what I've tried so far

File > options > mail > message format > convert to plain text format. - It still sends as winmail.dat

Contacts >'click on individual contact' > double click on email address > more options > outlook properties >'changed 'let Outlook decide' to 'send plain text only'

Diane Poremsky

Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange

Diane Poremsky

Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
oh... and also delete the autocomplete entry for the address as RTF settings can be saved in it.
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