MAILSTEIN VS SPARKPOST

SparkPost sends from their cloud. mailstein sends from your own server.

SparkPost (now part of Bird) is proven enterprise-grade cloud email — high throughput, mature deliverability tooling. But the IP, the reputation, and the message logs live in their infrastructure, priced and shaped for enterprise contracts. mailstein runs the Postal MTA on hardware you control, so the sending IP is yours, the logs stay on your servers, and pricing is simple per-send.

Start free →See the difference

Two honest models

SparkPost is a strong platform. The real question is where your sending infrastructure and your data live — and how you get billed for them.

SparkPost / Bird
enterprise cloud sending
Your app API / SMTP
↓
SparkPost cloud shared or leased IP pool
↓
Recipient inbox
Reputation and message logs live in Bird's cloud, on Bird's terms.
mailstein
your infrastructure
Your app API / SMTP / SDK
↓
Postal MTA on your server your dedicated IP
↓
Recipient inbox
Your IP, your reputation, your logs — all on hardware you control.

Feature by feature

mailsteinSparkPost (Bird)
Sends from an IP you ownYes — your server, your dedicated IPNo — Bird's cloud IP pools
Message logs stored on your infrastructureYesNo — retained in Bird's cloud
Transactional + broadcast on one platformYes — one platformCloud sending focused; broadcast via wider Bird suite
Billed per send, not per contactYesVolume tiers, enterprise contracts
Auto SPF / DKIM / DMARC setupYes — generated per domainManual DNS configuration
Dedicated IP with managed warm-upYes — included, managedAvailable, typically enterprise-tier
Bounce & complaint suppressionYes — built inYes
REST API, SMTP, webhooksYesYes
SDK / CLI / MCP for agentsYesSDKs; no MCP
Free tier without a credit cardYes — 50 emails/mo + 1 domainTrial-based, sales-led onboarding

Why teams pick mailstein

Not because SparkPost is bad — because ownership and simplicity beat a rented cloud pipe for most teams.

OWNERSHIP

Your reputation, not a shared pool

On mailstein you send from a dedicated IP tied to your domain, with managed warm-up. Your deliverability is a function of your own behavior — not a neighbor's spam run in a shared cloud pool.

A deliverability dip on your IP is yours to diagnose from your own logs — not a support ticket into someone else's cloud.
DATA

Logs stay on your servers

Every send, bounce, open, and complaint is recorded on infrastructure you run. Nothing about who you email or what you send is retained in a vendor's cloud you don't control.

Compliance asks where recipient data lives. The answer is "our server," not "a third-party cloud region."
PRICING

Per send, no enterprise sales call

Free is 50 emails/month with one domain and no card. Paid scales premium by volume — roughly $130/mo at 125K sends and $520/mo at 700K — billed per send, never per contact.

You size your plan by how much mail you send, not by how many people are in your list or how good your negotiator is.
SAME API SHAPE, YOUR INFRA

Migrating is a few lines

mailstein speaks REST and SMTP, so pointing your app at your own sending server is a config change, not a rewrite. Swap the endpoint and key, keep your templates, and every send now lands in logs you own.

// send from your own server + IP await mailstein.emails.send({ from: "receipts@yourdomain.com", to: user.email, subject: "Your receipt", html: template }) // SPF/DKIM/DMARC already set on your domain

Stop renting your sender reputation.

Send transactional and broadcast email from infrastructure you own — dedicated IP, managed warm-up, logs on your servers, simple per-send pricing. Start on the free tier, no card required.

Start free →