Please note that you should avoid using Safari when copying your email signature, in some cases it causes layout errors in your email signature. Please use Google Chrome or Firefox.
- Select the email signature using your cursor and copy it to your clipboard
Open Apple Mail and go to your preferences, then the signature tab. In the signature tab, create a new signature and paste your email signature from the clipboard. Once pasted, the images will show as empty boxes as seen in the animated gif below, close this window and your email signature should be working.
If you are using Mac Os Siera be sure to disable the Always Match My Default Font before pasting your signature.
Create a new email and voila! Your new email signature should be there. If you do not see your new email signature, make sure you have it selected in the signature drop down on your new email window.