Hello @LoriE52 ,
This isn't something we control. Receiving email clients will display the image you have associated with your email address, if you're using self-authentication. If you don't have an image set for your email address, on your email client / domain host side, then it won't show. Some email clients, depending on their default or the receiving contact's settings, won't display favicons.
In either regard, favicons for sending/receiving emails isn't something that can be managed within the system.
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