To add images to an email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the email signature or host it externally and then link to it.
The vast majority of email clients display logos/images in an email signature without any major issues, so there might not appear to be much difference between using the two formats. However, there are benefits to choosing one method over the other.
Expert: Bradley Shepard, Senior Product Specialist
Official Website: https://www.exclaimer.com