SMTP Relay Cost Calculator

Relay vs Dedicated Infrastructure

SMTP relays are convenient but have tradeoffs at scale:

• Shared reputation: Your deliverability is tied to other customers on the same IPs
• Volume caps: Burst sending is rate-limited on most relay platforms
• Data privacy: All email content passes through the relay provider's infrastructure

At above ~500,000 emails/month, dedicated SMTP infrastructure typically delivers lower cost-per-email, full IP control, and better deliverability for high-volume senders.

Related Calculators

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• IP Warm-Up Schedule
• SMTP Throughput Calculator
• Complaint Rate Threshold
• Delivery Rate Calculator