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.

Read the migration guide See Bird Email

By the numbers

Bird

Deliverability scale

~40% of commercial email

Message retention

30 days

Proven at peak

19.9B emails, BFCM 2025

What MailerSend is great at.
Where Bird is different.

What MailerSend is great at

Bundled validation credits. Verification volume is included in every plan rather than billed per call, and it covers bulk list cleaning. Bird validates one address at a time and bills per lookup.

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 bundled validation credits, very low entry pricing, and its drag-and-drop template builder. Bird wins on idempotency, global omnichannel, and deliverability heritage on the SparkPost network, and matches MailerSend on SMTP submission and real-time address validation. Both readings are accurate today.

Capability	Bird	MailerSend
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	Customer-facing relay at eu1 and us1.smtp.bird.com. Implicit TLS on 465, STARTTLS on 587 and 2525, authenticated with a normal API key.	Customer-facing SMTP relay on every plan, including Free.
Email address validation	Real-time validation: a deliverability verdict, a 0-100 confidence score, role, disposable and free-provider flags, and a typo correction. One address per call, billed per lookup.	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

send.ts

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

send.ts

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.

Read the migration guide See the email surface

Bird vs MailerSend: common questions

Why choose Bird over MailerSend?

For deliverability heritage and reach. Bird runs on SparkPost, which carries about 40% of the world’s commercial email, and offers global SMS and voice on the same API, idempotent sends, and 30-day message history on every plan. MailerSend is a solid, affordable email API but is younger and email-centric, with SMS limited to the US and Canada.

Is Bird cheaper than MailerSend?

It is close. Bird is $20/mo at 50K versus MailerSend’s $35, and lower at 1M, while around 250K the two are within a few dollars. Pick on features and reach rather than price alone.

Does Bird offer an SMTP relay and email validation like MailerSend?

Yes to both. Bird's SMTP relay runs at eu1.smtp.bird.com and us1.smtp.bird.com, on port 465 for implicit TLS or 587 and 2525 for STARTTLS, authenticated with a normal API key. Address validation returns a deliverability verdict, a 0-100 confidence score, role, disposable and free-provider flags, and a typo correction. Bird validates one address per call and bills per lookup, so MailerSend's bundled credits are still the better fit for cleaning a whole list.

Does Bird have idempotent sends?

Yes. Bird’s send accepts an Idempotency-Key that is reused across retries, so a retried request never produces a duplicate email. MailerSend has no request-level idempotency key.

Compare Bird to other platforms

See how Bird compares to the other transactional email platforms.

Bird vs SendGridLower cost at scale, idempotency, and channels beyond email.Bird vs Amazon SESManaged deliverability and a simple API instead of AWS plumbing.Bird vs MailgunCheaper at every tier, with idempotency and longer history.Bird vs PostmarkMuch lower cost at scale, with omnichannel and idempotency.Bird vs BrevoTransactional depth and a developer-first API.Bird vs ResendThe same modern DX, plus omnichannel and SparkPost scale.All comparisonsSee every Bird email comparison in one place.