Your email costs shouldn’t grow every time you do.
Resend is a developer-friendly email API built on top of Amazon SES. It’s a great starting point, until your volume grows and per-message pricing starts eating your margins.
unMTA gives you dedicated email infrastructure starting at $450/mo. Send 100K or 10M. Your bill stays the same.
How They Compare
Infrastructure
Resend
Multi-tenant infrastructure on Amazon SES. Your emails share resources with every other Resend customer.
unMTA
Single-tenant MTA instances. Your infrastructure runs in isolation with no shared queues and no noisy neighbors.
IP Addresses
Resend
Shared IP pool by default. Dedicated IPs available as a $30/mo add-on on the Scale plan, requiring 500+ sends/day.
unMTA
Dedicated IPs included on every plan. We handle warmup, authentication, and ongoing monitoring as part of the service.
Pricing Model
Resend
Per-message pricing. Costs increase with every email you send. At 1M emails/mo you’re at $650, and it keeps climbing.
unMTA
Flat monthly rate. Unlimited sending on every plan. Your costs are predictable regardless of volume.
Deliverability Management
Resend
Shared IP reputation. Automatic suppression lists. DKIM/SPF/DMARC authentication.
unMTA
Dedicated IPs with professional deliverability management included on every plan. We handle IP warmup, DNS authentication, monitoring, and ongoing tuning so you can focus on sending.
Observability
Resend
Dashboard, webhooks, and 30-day log retention (all plans).
unMTA
Dashboard, webhooks, S3 log archival, and configurable retention. Your data, exported on your terms.
Underlying Technology
Resend
Built on Amazon SES. Your email delivery depends on a third-party service you don’t control.
unMTA
Powered by KumoMTA, a high-performance MTA built by engineers with decades of experience running some of the largest email platforms in the world.
What You'll Actually Pay
Resend charges per message. unMTA charges a flat rate. Here's what that looks like at real-world volumes.
Resend
Scale (1M tier)
$650/mo
Transactional, per-message pricing
unMTA
Launch (annual)
$450/mo
Flat rate, unlimited sending
You save $200/mo with unMTA
Resend pricing from resend.com/pricing, March 2026. unMTA pricing includes dedicated IPs and unlimited sending with no add-ons or overages.
Dedicated to You, Controlled by You
Hardware Isolation
Resend
Logical isolation within AWS. Your data shares physical infrastructure with other customers.
unMTA
Dedicated instances with no shared resources. Your MTA doesn’t share memory, disk, or network with anyone else’s workload.
Data Retention
Resend
30-day retention on all plans. No export options beyond the dashboard.
unMTA
Configurable retention with full export via webhooks and S3. Keep your data as long as you need it.
Cost Predictability
Resend
Per-message pricing means your costs are a function of your growth. Budget accurately only if you can predict your volume months out.
unMTA
Flat-rate plans. Whether it’s a slow month or your biggest product launch, the bill is the same.
When Resend Is the Better Fit
Quick start
Send your first email in under five minutes. Resend’s API and documentation are genuinely excellent for getting started fast.
React Email
If you build email templates in JSX, Resend’s React Email integration is best-in-class. It’s a real competitive advantage and they deserve the credit.
Low volume
If you’re sending a few thousand emails a month, per-message pricing is simpler and cheaper than running dedicated infrastructure. There’s a volume threshold where dedicated infrastructure makes sense, and below it, Resend is the right tool.
Most teams hit a crossover point somewhere between 100K and 500K emails per month, where the per-message model starts costing more than a flat-rate dedicated setup. If you’re approaching that range, or already past it, that’s what we built unMTA for.
Predictable costs. Dedicated infrastructure. Full control.
Every unMTA plan includes dedicated IPs, unlimited sending, and hands-on deliverability management. Starting at $450/mo.