How to Add Your Signature to Apple Mail

Set up your email signature on Mac

Apple Mail on Mac

In Apple Mail, go to Mail → Preferences (or press ⌘,)

Click the "Signatures" tab at the top of the preferences window

Click the "+" button to add a new signature

Give it a descriptive name like "Work" or "Personal"

Uncheck "Always match my default message font"

Critical: This must be unchecked or your formatting will be lost!

Click "Copy HTML" on your signature

Click in the signature editor

Delete any existing text

Paste your signature (⌘V)

Drag your signature to the email account(s) you want to use it with

Or use the "Choose Signature" dropdown for each account

Close the preferences window

Compose a new email to see your signature

Make sure "Always match my default message font" is unchecked. This is the most common issue.

Apple Mail can be picky about images. Ensure they are:

Create multiple signatures and assign each one to specific email accounts by dragging them in the preferences.