Frequently Asked Questions

Void Relay is a developer-friendly email API that works with your own SMTP infrastructure. Think of it as Resend or SendGrid, but you bring your own SMTP server—no vendor lock-in, full control over your email delivery.

Unlike Resend, SendGrid, or Mailgun, Void Relay does not host your emails. You bring your own SMTP server (Gmail, AWS SES, your own server, etc.), which means no vendor lock-in, lower costs, and full control. We provide the REST API, webhooks, and tracking—you provide the SMTP infrastructure.

Yes, if you want the developer experience of Resend but prefer to use your own SMTP infrastructure to avoid vendor lock-in. Void Relay offers similar features (REST API, webhooks, tracking) but gives you full control over your email delivery provider.

Yes! That is the core feature of Void Relay. You can use any SMTP provider: Gmail, SendGrid, Mailgun, AWS SES, Postmark, or your own self-hosted SMTP server. You have complete freedom and no vendor lock-in.

Void Relay works with any SMTP provider including: Gmail/Google Workspace, AWS SES, SendGrid, Mailgun, Postmark, Mailchimp Transactional (Mandrill), Microsoft 365/Outlook, Zoho Mail, and any custom SMTP server. If it speaks SMTP, it works with Void Relay.

Yes! You can configure multiple SMTP servers in your dashboard and choose which one to use for each email or API key. This is useful for load balancing, failover, or using different providers for different types of emails.

Yes, Void Relay provides real-time webhooks for delivery notifications, open tracking, click tracking, and bounce handling—just like Resend or SendGrid, but with your own infrastructure.

We support: email.sent, email.delivered, email.bounced (hard and soft), email.opened, email.clicked, and email.complained (spam complaints). Each webhook includes detailed metadata about the event.

Yes, the dashboard provides real-time analytics including delivery rates, bounce rates, open rates, click rates, and detailed logs for every email sent through the API.

Yes! Void Relay offers an official TypeScript/JavaScript SDK available on npm (@voidvalue/relay). The SDK provides full type safety, automatic email validation, and zero dependencies. SDKs for Python, Go, and other languages are coming soon.

Void Relay's REST API works with any programming language (JavaScript, TypeScript, Python, Go, PHP, Ruby, Java, C#, etc.). We currently offer an official TypeScript/JavaScript SDK, with Python and Go SDKs coming soon.

Void Relay provides a simple REST API similar to Resend. You can integrate it with any programming language or framework in minutes. Just configure your SMTP server, create an API key, and start sending emails through our API.

Yes! Void Relay has a generous free tier. During our beta, you get 5,000 emails per day per API key (up to 5 API keys = 25,000 emails/day total). The free tier includes all features: unlimited SMTP servers, webhooks, tracking, and analytics.

Free tier: 2,500 emails/day per API key (12,500/day total with 5 keys). Beta users get 5,000 emails/day per API key forever. Pro plan ($2/month) includes 20 API keys with higher limits.

Only successfully sent emails count toward your limit. Failed emails, bounces, and test emails in the dashboard do not count.

Yes. All API connections use HTTPS/TLS. Webhook signatures are verified using HMAC-SHA256. We store minimal data—just email metadata (to, from, subject, timestamps) for tracking and analytics. Email content is processed and passed to your SMTP server but not retained.

Yes. Void Relay acts as a data processor under GDPR. You maintain control over your data since you use your own SMTP infrastructure. We process data only as instructed and have appropriate technical and organizational measures in place.

API keys are hashed using bcrypt before storage. We never show full API keys in the dashboard after creation—only a prefix for identification. You can revoke and regenerate keys instantly if needed.