Errors & Troubleshooting
HTTP status codes, common send failures, DNS issues, and debugging playbooks.
- Email API Error CodesPeople search for: email API error codesOpen →
- 401 Unauthorized FixesPeople search for: email API 401 unauthorizedOpen →
- 403 Forbidden and Domain IssuesPeople search for: email API 403 forbiddenOpen →
- 422 Validation ErrorsPeople search for: email API 422 validationOpen →
- 429 Rate Limit HandlingPeople search for: email API 429 rate limitOpen →
- Emails Not Arriving ChecklistPeople search for: emails not arriving APIOpen →
- DKIM Fail TroubleshootingPeople search for: DKIM fail troubleshootingOpen →
- SPF Fail TroubleshootingPeople search for: SPF fail troubleshootingOpen →
- DMARC Fail TroubleshootingPeople search for: DMARC fail troubleshootingOpen →
- Attachment Rejected ErrorsPeople search for: email attachment rejectedOpen →
- Template Render FailuresPeople search for: email template rendering failureOpen →
- Timeout and Network ErrorsPeople search for: email API timeoutOpen →