Monogram or watermark for legitimate internal emails.
Monogram or watermark should be added below the signature for legitimate internal emails so that end users can recognize whether it is from a legitimate co-worker or employee of the same company.
Please review this topic and let us know if this existing feature would meet your needs, https://support.office.com/en-us/article/secure-email-messages-by-using-a-digital-signature-65dd1ea9-7741-4afd-b44d-9243ce107c50. If you search “Outlook digitally singed email” in Bing images you can see the icons that show that it is signed.
More and more as we move toward mobile data devices and social media, there is a difficulty in using image logos in email as it creates inadvertent and often multiple attachments in the emails. support of web fonts is needed to give companies the ability to build Letter Marks and / or Word Marks to represent logos. -- without support for webfonts, the use of such branding marks within signatures and email templates are quite restrictive.
Is there any way the recipient of a photo or file is unable to copy the same. In other words protecting the copyright of the photo. Watermark or other method.
Maybe a corporate wide or server-wide digital signature. But somehow the signature would have to be instantly recognized (like an icon or coat of arms), but with no way for an outsider to forge it.
Or maybe reserve a email frame color for email that never left the server, that was internal to the person's exchange server.
Email that was internal to the server would have a frame in a distinctive and reserved color. Done in a way that could not be forged by an outsider with special stationery.