A smarthost is an external SMTP mail server. Instead of delivering emails directly to the recipient, it first forwards them to the smarthost. The hosting provider then forwards the email, after authenticating it (usually via SMTP-AUTH over port 587 or 465), to the configured smarthost, which handles the subsequent delivery to the recipient’s mail server.

• Sending emails via an external email provider’s SMTP server
• Using a specialized transactional email service (e.g., Mailjet, SendGrid, Amazon SES)
• Centralizing email sending from multiple servers through a single outgoing relay

1. Log in to the Webhosting Control Panel (WCP).
2. Go to Mail > Smarthosts.

3. Select the desired domain.

4. Check the box next to Send mail via a smarthost.

5. Enter your smarthost’s hostname or IP address and port.

6. If your smarthost service requires authentication, check the corresponding box and enter your 
    username and password.

7. Click Save.

1. Update the SPF record and DKIM records in the DNS zone of the domain you have configured. This ensures that the SMTP relay service is authorized to send emails on behalf of this domain.
2. Most commercial SMTP relay services also require domain authentication on their end:
   • Go to your smarthost service and authorize the domain for which you have just configured the smarthost.
3. Send a test email to an external email service and make sure that sending works.
4. Your smarthost is now fully set up.

DNS Records