Note:
1. Only if your email address contains an authenticated domain name, emails will be sent using that domain. If not, emails will be sent using the default domain from Zoho Forms.
2. If DKIM is verified under control panel and the sender's email domain is the verified domain, then emails are automatically signed using that domain by default.
3. If SMTP email delivery encounters an issue, the form emails will be automatically routed through the default server.