I thought that this short video (06:06) from MacMost was a good start to customizing your mail signatures under macOS.
You can actually do far more than that. The Mail signature files for macOS Catalina are found in /Users/[your user ID]/Library/Mail/V7/MailData/Signatures/. This is an HTML file, so you can take advantage of that to further customize your signature.
Select a signature file to customize. Apple’s naming convention for signature files is not intuitive. I recommend that you create a new signature file.
- Open Mail then go to Preferences > Signatures > enter “+” to add a new signature
- Type in the text you want to appear
- Close Preferences
- Quit Mail
Now in your Finder go to /Users/[your user ID]/Library/Mail/V7/MailData/Signatures/. Select the file with today’s date and open it for editing. I use BBEdit for this.
The file is larger than you might expect. Insert the HTML you want for customizing the signature. I added a table with one row and two data fields. The field on the left has artwork, the field on the right now has my text. Save the file.
In Finder select the updated file and Right-Click (or Control-Click) on it. Select “Get Info”. Now click on the “Locked” box. If you do not do this, Mail will overwrite the changes you made to the Signature file.
Now open Mail and you will find the updated signature is ready for use. One of my signatures now looks like the image below. It now identifies the topics I most often post about on my Blog – Mac & iOS, WWII, and Books. Those interests are also reflected in a simple image.
See my other macOS posts