Bird vs MailerSend
The MailerSend alternative.
MailerSend is a clean, affordable email API with a few features Bird does not match. Bird runs on SparkPost, the platform it acquired in 2021 that carries about 40% of the world’s commercial email, and adds idempotency, global SMS and voice on the same API, and a decade of deliverability engineering. Here is where each one fits. See the Bird Email API for the full surface.
By the numbers
Deliverability scale
Message retention
Proven at peak
19.9B emails, BFCM 2025What MailerSend is great at.
Where Bird is different.
What MailerSend is great at
A customer-facing SMTP relay on every plan. Including the free tier. Apps that already send over SMTP move across with no code change. Bird offers HTTP send only.
Bundled email validation. Verification credits are included in every plan, with a dedicated validation API. Bird does not offer address validation today.
Very low entry pricing. A real free tier and a $7 hobby plan, with transparent flat overage. A gentle on-ramp for small projects.
Drag-and-drop templates. A friendly template builder for teams that want to design email without writing the HTML.
Where Bird is different
Built on SparkPost. Bird’s email runs on SparkPost, the deliverability platform Bird acquired in 2021. It carries about 40% of the world’s commercial email and brings more than a decade of IP-reputation engineering.
Global omnichannel. Email, SMS, and voice from one API, worldwide. MailerSend has an SMS product, but it is limited to the US and Canada and there is no voice.
A modern API. Errors as values with .safe(), and an idempotency key reused across retries so a retried send is never a duplicate. MailerSend has no idempotency key.
Standard 30-day history. Bird stores a sent message body for 30 days on every plan; MailerSend’s activity retention is 7 days on Starter, 30 on Professional.
The matrix
Capability by capability.
MailerSend wins on a customer SMTP relay on every plan and bundled email validation. Bird wins on idempotency, global omnichannel, and deliverability heritage on the SparkPost network, with competitive pricing. Both readings are accurate today.
| Capability | Bird | MailerSend | Who wins? |
|---|---|---|---|
| Transactional send API | HTTP API (POST /v1/email/messages) with an error-as-value SDK. | HTTP API (POST /v1/email) with single and bulk send, on all plans. | |
| SMTP relay | Not offered to customers; HTTP API only. | Customer-facing SMTP relay on every plan, including Free. | |
| Email address validation | Not available today. | Built-in verification with credits bundled in every plan. | |
| Idempotency on send | Idempotency-Key header, reused across retries. | No idempotency key; dedup is left to the consumer. | |
| Channels beyond email | Email, SMS, and voice in the same API, worldwide. | SMS in the US and Canada only; no voice. | |
| Deliverability heritage | Runs on SparkPost (acquired 2021): roughly 40% of the world’s commercial email. | A capable younger platform without comparable scale heritage. | |
| Stored message retention | Stored message body available for 30 days on every plan. | Activity retention 7 days (Starter) to 30 days (Professional). | |
| Cost at comparable volume | $20/mo at 50K, $170/mo at 250K, $525/mo at 1M. | $35/mo at 50K, roughly $163 at 250K, $600 at 1M. | |
| SPF, DKIM, DMARC | SPF, DKIM, and DMARC signed for verified domains, with optional BIMI. | SPF, DKIM, and DMARC supported. | |
| Event webhooks | Twelve event types with Standard Webhooks signing. | A rich set of activity and system webhook events. |
The same send
The send call has a similar shape.
Sending one HTML email. MailerSend builds the message through parameter objects. Bird is a bearer-token call that returns a typed result. The fields map directly.
MailerSend
import { MailerSend, EmailParams, Sender, Recipient } from "mailersend";
const ms = new MailerSend({ apiKey: process.env.MAILERSEND_API_KEY! });
await ms.email.send(
new EmailParams()
.setFrom(new Sender("onboarding@yourdomain.com", "Acme"))
.setTo([new Recipient("customer@example.com")])
.setSubject("Your March invoice")
.setHtml("<p>Attached.</p>"),
);Bird
import { BirdClient } from "@messagebird/sdk";
const bird = new BirdClient({ apiKey: process.env.BIRD_API_KEY! });
const { data, error } = await bird.email
.send({
from: { email: "onboarding@yourdomain.com", name: "Acme" },
to: ["customer@example.com"],
subject: "Your March invoice",
html: "<p>Attached.</p>",
})
.safe();
if (error) console.error(error.message);
else console.log(data.id);Pricing at a glance
MailerSend’s figures are its Starter plan.
| Emails / month | Bird | MailerSend |
|---|---|---|
| 50,000 | $20/mo (Starter) | $35/mo (Starter) |
| 250,000 | $170/mo (Premier) | $162.50/mo (Starter) |
| 1,000,000 | $525/mo (Premier) | $600/mo (Starter) |
Switching cost
Low.
The model lines up: domain authentication, a suppression list, and event webhooks per message state. The send fields map directly, and the activity events map cleanly to Bird’s email.delivered and email.bounced.
The work is re-pointing webhooks, importing the suppression list, and warming a dedicated IP if you have reputation to preserve. The migration guide covers each step.
Bird vs MailerSend: common questions
Why choose Bird over MailerSend?+
Is Bird cheaper than MailerSend?+
Does Bird offer an SMTP relay and email validation like MailerSend?+
Does Bird have idempotent sends?+
Compare Bird to other platforms
See how Bird compares to the other transactional email platforms.