Export the sig photo using the button above, then host it somewhere accessible (your website, SharePoint, or an image host). Copy the URL.
2
Copy the HTML below. In Outlook: File → Options → Mail → Signatures → select your signature → click the source/HTML button and paste. Replace IMAGE_URL with your hosted image URL.
Why a pre-made image? Outlook uses Word's rendering engine which strips CSS gradients, border-radius, and modern styling. By exporting the headshot-on-backdrop as a single PNG, what you see here is exactly what recipients see — no rendering surprises across email clients.