Standby Failover Auto-Routing

In enterprise environments, an email provider outage can cause lost sales receipts, missed password resets, and broken sign-ups. MailFuz Pro includes automated Standby Failover Routing.

How Failover Works

flowchart TD
    A[WordPress Action / wp_mail] --> B{Primary Transport Active}
    B -->|HTTP 200 / Success| C[Email Delivered & Logged]
    B -->|Timeout / Rate Limit / 5xx Error| D[Failover Triggered]
    D --> E[Switch to Standby Backup Transport]
    E --> F[Email Delivered via Backup]
    E --> G[Log Failover Event & Admin Alert]

Configuring Standby Failover

1. Go to MailFuz → Settings → General.
2. Scroll to the Standby Failover Transport section.
3. Check Enable Automated Standby Failover.
4. Secondary Backup Transport: Choose your backup engine (e.g. SMTP Relay, Postmark, or SendGrid).
5. Ensure credentials for both primary and secondary transports are filled in their respective settings tabs.
6. Click Save Settings.

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What Triggers a Failover?

• HTTP 5xx Server Errors: Provider outages, internal gateway timeouts (502, 503, 504).
• Connection Timeouts: Network latency exceeding provider timeout thresholds.
• Rate Limits (429 Too Many Requests): Temporary account burst quota exceeded.

When a failover occurs, MailFuz logs the exact error from the primary provider in the Email Logs audit table, marking the record with a FAILOVER (BACKUP) indicator.