The Real Cost of Email APIs: Pricing Comparison 2026
Email pricing is deliberately confusing
Every email API has a pricing page. None of them make it easy to compare. Resend charges per email with daily limits. SendGrid uses tiered plans with different feature sets at each level. Postmark charges per email with no free tier. Mailgun has hidden overage fees. AWS SES is cheap per-email but expensive in engineering time. The result: developers pick a provider based on the marketing page, then get surprised by the real cost 3 months later. This guide cuts through the marketing and compares what you'll actually pay.
Free tier comparison: what you actually get
AISend: 3,000 emails/month, all AI features included, no credit card required, shared domain available. Resend: 3,000 emails/month (100/day limit), single provider, credit card not required. SendGrid: 100 emails/day (3,000/month), limited analytics, no dedicated IP. Postmark: no free tier (starts at $15/month for 10,000 emails). Mailgun: no free tier (starts at $35/month). AWS SES: 3,000 emails/month free (if sending from EC2), but requires significant setup time. The key differences at the free level: AISend and Resend offer the same volume, but AISend includes multi-provider routing and has no daily cap. SendGrid's daily limit of 100 is restrictive for testing. Postmark and Mailgun have no free option at all.
At 50,000 emails/month: where costs diverge
This is the sweet spot where most growing SaaS apps land. AISend Pro: $14/month (all features, multi-provider routing, AI optimization). Resend Pro: $20/month (single provider, no AI features). SendGrid Essentials: $19.95/month (limited features, complex API). Postmark: $50/month (excellent deliverability, no AI routing). Mailgun Foundation: $35/month (basic features). AWS SES: $5/month (raw sending only — add $2,000-5,000/month in engineering time for bounce handling, analytics, and monitoring that other providers include). At this volume, AISend is the cheapest full-featured option. SES looks cheapest on paper but the engineering overhead makes it the most expensive in practice.
Hidden costs most pricing pages don't show
Overage fees: SendGrid charges steep per-email overages when you exceed your plan limit — a surprise $200 bill is common. Feature gating: SendGrid reserves advanced deliverability features for Pro plans ($89.95/month). Resend charges $20/month but doesn't include send time optimization or content scoring. Dedicated IPs: most providers charge $20-50/month extra for a dedicated IP, which is essential above 100K emails/month. Support: enterprise-level support typically adds 20-30% to your bill. Migration cost: switching providers takes 2-20 hours of engineering time depending on how deeply integrated your email is. AISend includes all AI features on every paid plan and offers Resend-compatible API for zero-cost migration.
Our honest recommendation
Under 3,000 emails/month: use AISend or Resend free tier — both are solid. At 10K-50K: AISend Pro ($14) gives you the most for the least money, with multi-provider routing that Resend doesn't offer. At 50K-100K: AISend Business ($63) adds dedicated IP — compare to SendGrid Pro ($89.95) for similar features. At 100K+: AISend Scale ($149 for 500K) or negotiate enterprise pricing. Only use raw SES if you have a dedicated email engineering team to build and maintain the infrastructure. The cheapest email is not the one with the lowest per-email price — it's the one that actually reaches the inbox. A 95% delivery rate at $0.001/email costs more in lost users than a 99% delivery rate at $0.003/email.
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