You can specify the default signature applied to all outgoing Email Templates sent from WHMCS. Read on to find out how.
Navigate to Configuration > System Settings > General Settings > Mail Tab

Specify your desired signature in the Global Email Signature box:

Click Save Changes
Email Display
The email signature you have just setup will now be shown anytime the {$signature} variable is used in an email template:

The End! should you have any inquiries, we encourage you to reach out to the Vercaa Support Center without hesitation.