mailstein vs Resend

Resend gives you a clean API.
mailstein gives you the whole pipe.

Resend is a polished layer on top of Amazon SES. mailstein sends straight from infrastructure you own — your IP, your reputation, your logs. Same clean developer experience, without renting someone else's mail server.

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We like Resend — the API is clean and React Email is genuinely good. If you want a hosted wrapper on SES and never want to think about infrastructure, they're a fine choice. This page is for teams who'd rather own it.

What's actually under the hood

Every email you send tells a story about who controls your reputation. Here's the difference.

Resend
two providers · an extra hop
Your app API
↓
Resend wrapper
↓
Amazon SES shared pool
↓
Inbox
Your mail rides Amazon's shared SES reputation and passes through a provider you don't control. Great until SES throttles or a noisy neighbour drags the pool down.
mailstein
one provider · you own it
Your app API
↓
Your mailstein server your IP
↓
Inbox
Your own IP, your own reputation, your own logs. No shared pool, no extra hop, no third party deciding your send rate. If something needs tuning, it's your box.

mailstein vs Resend, line by line

The places it counts when email is carrying real revenue.

mailsteinResend
Sending infrastructureYour own server & IPAmazon SES (wrapped)
Who owns your reputationYou doShared SES pool
Message logs & retentionOn your box, as long as you wantHosted, limited on lower plans
Transactional + broadcast, one priceYesMarketing billed per contact
Billed per send, never per contactYesNo
Dedicated IP + managed warm-upYesAdd-on
Clean SDK · CLI · MCPYesYes
REST API & SMTPYesYes

Why owning the infrastructure wins

Not abstractions — the moments where it actually bites.

REPUTATION

Your inbox placement isn't up for a vote

On a shared SES pool, a spammer three tenants over can drag your delivery down. On mailstein, the only sender on your IP is you.

"Our open rates tanked overnight and support blamed a shared pool." Not your problem when the pool is you.
DATA

Your logs don't disappear mid-debug

Every message and event lives on your infrastructure, for as long as you keep it. Search a send from six months ago without hitting a retention wall.

"A customer says they never got Tuesday's email" — and the record is right there.
BILLING

Growing your list doesn't grow your invoice

Resend bills marketing by the contact. mailstein bills by the send — transactional and broadcast on one meter. Ship to a million subscribers without a pricing surprise.

CONTROL

No third party deciding your send rate

No waiting on Amazon's timeline or a provider's queue. Need to tune throughput, add an IP, warm a pool? It's your server — do it now.

Stop renting your reputation.

Everything you like about Resend's DX, running on infrastructure that answers to you. Verify a domain and send in five minutes.

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