b) Open ‘Mail’ from the LaunchPad. From the ‘Mail’ menu, click ‘Preferences’
c) Click on the ‘Signatures’ tab. Select an account on the left (e.g. Google) - **it must not be left as “All signatures”**. Click on the ‘plus’ button and add a new signature for the selected account.
d) Click on the ‘Composing’ tab at the top and change the ‘Message Format’ dropdown to ‘Rich Text’
e) Open ‘TextEdit.app’ from the LaunchPad. From the ‘TextEdit’ menu, click ‘Preferences’
f) Click the ‘Open and Save’ tab, and tick “Display HTML files as HTML code instead of formatted text”. Close TextEdit.app.
g) Open a ‘Finder’ window on your Mac and click ‘Go’ at the top. Hold down the ‘Option’ key on your keyboard to reveal ‘Library’, and click to open Library
h) In the ‘Library’ window, locate the ‘Signatures’ folder (this may differ slightly based on your version of MacOS):
i) In the ‘Signatures’ folder, find the most recent file ending in
.mailsignature. Command ⌘+Click and open with ‘Other…‘ and select “TextEdit.app”
k) Select everything from “<body style=…“ to the bottom of the document.
l) Close ‘Mail’. Launch Mail again. Your new signature will appear in the next email you create.