I have a requirement to keep some hidden text in user outgoing email. So that when we doing user mail copy in backend, we extract those hidden text and do some processing.
I am trying to add div like below :
<div class="customerClass">
<span style="color:white;display:none" class="CustomerClass">hidden Text</span>
</div>
But Outlook for Mac is stripping all div tags, and class property of span tags.
What is effective way to pass custom information with outgoing mail using Outlook Web Add-in API's?