Building a Multi-Provider Email Strategy for Maximum Reliability

What happens when your email provider goes down? Or when they flag your account for "suspicious activity"? If you are relying on a single provider, your users do not get their password resets, order confirmations, or notifications.

Why Single-Provider is Risky

Even the biggest email providers have outages. Here are the risks:

• • Account suspensions: Automated systems flag legitimate accounts
• • Rate limiting: Sudden spikes can trigger sending limits
• • IP reputation issues: Shared IPs affected by other senders
• • Geographic latency: Single-region providers slow for global users

The Multi-Provider Approach

With Void Relay, setting up multiple SMTP providers is straightforward:

Manual Fallback Configuration

Void Relay supports fallback SMTP configuration per SMTP config. Configure a fallback SMTP server for each of your primary SMTP configurations. If the primary fails, emails are automatically routed to your configured fallback.

• • Manual setup: Configure your fallback SMTP server in the dashboard
• • Per-SMTP fallback: Each primary SMTP can have its own dedicated fallback
• • Automatic routing: Once configured, emails automatically route to fallback on failure

Note: Users need to manually configure fallback SMTP servers in the dashboard. Multi-provider routing and health checks are not automatically managed.

Geographic Distribution

Different SMTP providers perform better in different regions:

• • US users: Route to AWS SES us-east-1 or us-west-2
• • EU users: Route to AWS SES eu-west-1 or European SMTP
• • Asia users: Route to AWS SES ap-southeast-1

Compliance & Data Residency

Some jurisdictions require data to stay within their borders:

• • Route EU user emails through EU-based SMTP servers
• • Keep sensitive emails on self-hosted infrastructure
• • Comply with GDPR, HIPAA, or other regulations

Cost Optimization

Multi-provider is not just about reliability—it is also about cost:

• • Use the cheapest provider for bulk/non-critical emails
• • Reserve premium providers for critical transactional emails
• • Balance load based on pricing tiers