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Relay

Relay

Inbound MX protection for your domain.

What is Relay and how does it protect your inbox?

How Relay filters spam and threats before they reach your mail server.

Setting up Relay for your domain

Step-by-step: MX records, SMTP destination, and testing your setup.

Configuring per-address relay settings

Custom spam thresholds and configuration for each protected address.

Understanding relay delivery failures and retries

What happens when SMTP forwarding fails, how the retry queue works, and how to fix common issues.

Relay verification token - prevent email bypass

How to configure the X-Cleanbox-Validation header to ensure email can only reach your server through Cleanbox.

Relay spam symbols and virus scanning

How relay spam symbol rules work, what each authentication and content symbol means, and how ClamAV virus scanning protects your mail server.

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