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Jon Jardine
XMLNS Attributes in HTML tag in Email Templates
Hey, unfortunately at time of writing (October 2022) the email template editor (when you paste in HTML) still doesn't support XMLNS attributes in the HTML tag. This prevents Outlook from rendering emails correctly when sent from Salesforce as these attributes must be removed. Does anyone have a workaround or a solution to implement this? Pardot email templates accept these tags.
There is an Idea to have this functionality implemented
https://ideas.salesforce.com/s/idea/a0B8W00000Gdi3hUAB/support-css-html-format-in-lightning-email-template-same-as-classic-templates
I've not come across any workaround for this scenario.
Thanks