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Inbox auto reply

An inbox replier lets you define automated responses when matching emails are received by an inbox.

repliers

Configuration​

Repliers can be added to inboxes. When the inbox receives an email the email will be checked against any matching rules on the replier. If it matches then an automated response will be sent using the replier's body or template.

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Typical use cases​

  • Send immediate acknowledgement responses for support or intake inboxes.
  • Return standardized guidance when specific subject/body patterns are detected.
  • Route auto-responses per environment (staging vs production) with different inbox setups.
  • Build mailbox-side fallback responses when upstream systems are unavailable.

How matching works​

  1. An email arrives in the target inbox.
  2. MailSlurp evaluates the message against configured replier matching rules.
  3. If rules match, the configured replier response is sent automatically.
  4. If no rule matches, no auto-reply is sent.

Use narrow matching criteria when possible to avoid sending generic replies to unintended messages.

  1. Start with one inbox and one narrowly scoped replier.
  2. Test subject/body/sender matching with representative real messages.
  3. Verify the response format and links before enabling broader rules.
  4. Add event monitoring and alerting for send failures.
  5. Document ownership and change control for each active replier.

Safety guardrails​

  • Avoid broad catch-all matching until you have validated expected traffic patterns.
  • Keep replier content short, explicit, and action-oriented.
  • Avoid auto-reply loops by filtering known automated senders where possible.
  • Review replier behavior after major upstream template or workflow changes.

Events​

You can use event endpoints to measure the quantity and success or failure of responses.

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Troubleshooting​

  • No response sent: check inbox binding and matching criteria first.
  • Unexpected responses: tighten matching logic and validate with sample payloads.
  • Low deliverability of auto-replies: review sender domain setup and reputation controls.