A signature is automatically placed at the end of each e-mail message. Let’s see how to create one.
Go to Mail.
Click Preferences.
Select the Signatures tab.
To delete a signature, select it.
And click the minus sign.
Clicking OK will permanently remove the signature. This cannot be undone.
Let’s add a new signature by clicking the plus icon.
Give this signature a name.
Click in this box and type to edit the signature.
It’s possible to create different signatures for each e-mail address you have added to Mail instead of using the same one for all accounts.
Click an account.
Now add a new signature as we did in the last step.
Set the default signature to use for this account.
That’s it! Now you know how to create and manage your signatures.