You can customize any of the emails that your WHMCS installation sends to your customers. WHMCS sends email whenever specific actions occur, and each action has an associated email template that you can customize from within the Admin Area.
You can disable all outgoing mail from your WHMCS installation. This allows you to test customizations, verify system changes, or perform other routine tests without sending email to customers.
You can restore the email templates that ship with WHMCS to their default contents. This can help you correct problems with customizations or resolve Email Template Not Found errors.
You can set the email signature that WHMCS adds to all outgoing email templates. This signature will automatically appear at the end of every email message that the system sends to your customers using an email template.
You can configure Google as your mail provider using SMTP. This requires creating an app in the Google Cloud console and configuring SMTP as your mail provider.
You can configure Microsoft® as your mail provider using Microsoft Entra® ID (formerly Azure Active Directory). To do this, you will also need to create an app in the Microsoft Entra console.