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Choose the “Signatures” tab, then click the plus button to add a new signature, or select an existing signature to modify it.
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You’ll want to be sure you have an image file or logo handy to use, put the image file somewhere easy to locate or find so that you can access it easily from the Mac Mail app. How to Create an Image Signature in Mail for Mac All you need is a logo or picture to use, and a few moments of your time. This method works to add any image to a signature, thereby making a custom image or logo signature in nearly every version of Mail for nearly every version of Mac OS, and it’s quite simple.
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