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Sender rules let you control who can send email to your inboxes. You can block specific senders or domains, or switch to allowlist mode so only approved senders get through.

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How it works

Every inbound email is checked against your sender rules before delivery. Rules match on either a full email address (user@example.com) or an entire domain (example.com). There are two rule types:

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Filter modes

Your account has an inbound filter mode that controls how rules are applied:

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Default mode (none)

In default mode, all inbound email is delivered unless the sender matches a block rule. Use this when you only need to block a few known bad senders.

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Allowlist mode

In allowlist mode, only senders that match an allow rule are delivered. All other email is dropped. Use this when your agent should only communicate with a known set of contacts.
Block rules are always enforced, even in allowlist mode. If a sender matches both an allow rule and a block rule, the block rule wins.

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Rule matching

Rules match against the sender’s email address (From header):
  • Email rules match the exact address: spam@example.com
  • Domain rules match any address at that domain: example.com blocks alice@example.com, bob@example.com, etc.
Values are case-insensitive and normalized to lowercase.

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Managing rules

You can manage sender rules from the Allow/Block List page in your Dashboard settings. From there you can:
  • Add email addresses or domains to your allow or block list
  • Switch between none and allowlist filter modes
  • Remove rules you no longer need

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What happens to filtered email

Emails that are blocked or not in the allowlist are silently dropped. They do not trigger webhook or WebSocket events, and they do not appear in your inbox.
Sender rules work alongside suppressions. Suppressions automatically block addresses that have bounced or been reported as spam. Sender rules give you manual control on top of that.