Submission Policy

Submission Policy

Submission policy sets global acceptance rules for trusted devices before SMTP DATA is accepted.

Open:

Settings -> Submission Policy

What It Controls

Global policy can define:

• maximum accepted message size;
• maximum recipients per message;
• allowed senders;
• blocked senders;
• allowed recipient domains;
• blocked recipient domains.

Device-specific rules on Trusted Networks are combined with global rules. When both layers define numeric limits, the stricter limit wins.

Sender Entries

Allowed and blocked sender entries support:

• exact addresses, such as scanner@example.com;
• domain entries, such as @example.com;
• wildcard domain entries, such as *@example.com.

If allowed senders is empty, any sender from a trusted device is allowed unless blocked by another rule.

Blocked senders take precedence over allowed senders.

Recipient Domain Entries

Allowed and blocked recipient domains support:

• exact domains, such as example.com;
• wildcard domains, such as *.partner.example.

Blocked domains take precedence over allowed domains.

Operating Guidance

• Start strict and expand only when a real device needs it.
• Prefer device-specific policy when one printer or app has unusual needs.
• Use global policy for organization-wide boundaries.
• Test policy decisions with Diagnostics Flow Checker.

Rejected submissions happen before message content is spooled.