Bird vs Postmark
Bird vs Postmark for transactional email
Bird operates the email sending infrastructure, manages IP reputation and builds its own delivery tools. Choose Bird when you want the team running your sending network to handle delivery feedback, with email, SMS and voice in one API.
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By the numbers
Bird network
About 40% of commercial emailStored message bodies
Up to 30 days, with storage enabledWho controls the sending stack?
Postmark: streams and managed delivery
Postmark’s Message Streams separate transactional and broadcast traffic, including their IP ranges. Keep Postmark when that built-in separation is central to your application.
Postmark monitors and optimizes dedicated-IP performance, handles feedback-loop registrations and offers managed warm-up with shared-pool overflow. Its team monitors receiver responses during warm-up.
Postmark’s inbound webhook delivers parsed message content and attachments to your application. Its 45-day default content retention gives support teams a longer inspection window than Bird’s up-to-30-day stored bodies, available when content storage is enabled.
Bird: infrastructure and reputation
Bird operates its sending infrastructure and develops MTA software, including PowerMTA, which Bird also licenses for self-hosted sending. Bird’s SparkPost sending network carries about 40% of the world’s commercial email.
Bird manages its shared sending IPs, dedicated IPs and pools, with automatic warm-up and shared-pool overflow. Bird’s delivery technology adjusts traffic per mailbox provider, while its platform processes delivery feedback and acts on bounce and complaint signals. These are controls Bird operates within its sending stack.
Bird provides Inbox Insights for placement estimates and seed tests, Email analytics for your own sending results, and Competitive Insights for observed competitor campaigns. Bird’s email team can help assess your requirements.
How do Bird and Postmark compare?
Compare Message Streams, stored content, retries and delivery controls.
| Capability | Bird | Postmark | Who wins? |
|---|---|---|---|
| Transactional send API | Bird’s TypeScript SDK throws typed errors by default; .safe() returns data and error. | Postmark’s ServerClient sends with sendEmail(data). Its Email API accepts JSON and supports single sends and batches of up to 500 messages. | |
| SMTP relay | Bird SMTP accepts port 465 with TLS or 587 and 2525 with STARTTLS, using an API key. | Postmark SMTP uses STARTTLS on ports 25, 2525 and 587. Authenticate with a Server API Token plus a stream header, or a stream-specific SMTP Token. | |
| Email address validation | Bird email lookup checks one address per call, returning a verdict, confidence, address flags and suggested corrections. | Postmark’s migration guide states that Postmark does not have an email validation service and points senders to an external validator. | |
| Idempotency on send | Bird retains completed responses for 3 hours; later retries are fresh requests. | Postmark’s idempotency guidance says it does not support an idempotency key feature and recommends safeguards in the integration. | |
| Stored message retention | Bird stores message bodies for up to 30 days when content storage is enabled. | Postmark stores full message content for 45 days by default; its Retention Add-on offers periods from 7 to 365 days on eligible plans. | |
| Published pricing | Bird email plans and rates are read live in the table below. | Compare the selected plan with Postmark’s published rates, including its billing period and features. | |
| Dedicated IPs and pools | Bird dedicated IP purchases are bounded by your plan’s IP quota. Automatic warm-up sends overflow through the shared pool. | Postmark’s dedicated-IP eligibility starts at 300,000 messages a month. IPs can be assigned to an account or individual servers; managed warm-up adjusts daily limits and sends overflow through the shared pool. | |
| Deliverability heritage | Bird acquired SparkPost in 2021. Its sending network carries about 40% of the world’s commercial email. | Postmark runs parallel sending infrastructures for transactional and broadcast traffic, with separate IP ranges. | |
| SPF, DKIM, DMARC and BIMI | Bird verifies DKIM, return-path and DMARC. BIMI is a separate DNS and logo configuration. | Postmark supports SPF, DKIM and DMARC. BIMI also requires logo configuration; the receiving mail client decides whether to display it. | |
| Event webhooks and signing | Bird signs webhook deliveries using Standard Webhooks. | Postmark’s webhook guide recommends HTTPS, HTTP Basic Authentication and IP allowlisting to protect the receiving endpoint. | |
| Channels beyond email | Bird’s API covers email, SMS, WhatsApp, voice, Verify and Realtime. | Postmark Message Streams cover transactional and broadcast email; its inbound webhook supplies parsed incoming email. | |
| Vendor and procurement | Review Bird’s published legal terms and policies against your existing agreement and procurement requirements. | Review Postmark’s published terms against your existing agreement and procurement requirements. | |
| Mailboxes | Bird’s agent mailboxes provide addressable inboxes, threads, replies and sender rules managed through code. | Postmark’s inbound webhook supplies parsed text, HTML and attachments. StrippedTextReply can extract the reply portion of an incoming message. | |
| Traffic separation | Bird IP pools can separate transactional and marketing sending; ip_pool_id selects a pool per message. | Postmark Message Streams route transactional and broadcast email to separate infrastructure through the MessageStream field. | |
| Agent tooling | Bird’s hosted MCP server at mcp.bird.com exposes 354 tools. The bird CLI sends and inspects email, manages domains, templates and webhooks, and gives agents JSON output and semantic exit codes. | Postmark’s MCP server covers sending, templates, message search, delivery diagnostics and account operations. Its CLI sends email, manages templates and lists servers. |
How do you send one HTML email?
Postmark’s ServerClient accepts a server token and sends PascalCase fields through sendEmail. Bird throws typed errors by default; this example opts into .safe() so the application can branch on data and error.
Postmark
import { ServerClient } from "postmark";
const client = new ServerClient(process.env.POSTMARK_TOKEN!);
await client.sendEmail({
From: "onboarding@yourdomain.com",
To: "customer@example.com",
Subject: "Your March invoice",
HtmlBody: "<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);
What changes around the send call?
How do Postmark Message Streams map to Bird?
How should I prevent duplicate sends during migration?
Published email plans
Bird’s full monthly ladder is shown below. Nearest-volume plans are labelled and are not quotes for Bird’s volume. Check billing terms, features and overages.
Pricing verdict: Bird. The verdict compares the lowest published monthly amount at each exact volume and currency; daily-only allowances, annual commitments, usage rates, starting prices and custom quotes are not compared.
| Bird tier | Emails per month | Bird | Postmark |
|---|---|---|---|
| Free | 1,000 | Nearest published volume | |
| Startup | 50,000 | 3 plans at this volumeExpand to compare every option and its billing terms. Matching volume Matching volume Matching volume Platform: $66.00/mo 50,000 emails Monthly billing; volume covers emails sent and received. as published | |
| Startup | 100,000 | 3 nearest published optionsExpand to compare every option and its billing terms. Nearest published volume Nearest published volume Nearest published volume Platform: $138.00/mo 125,000 emails Monthly billing; volume covers emails sent and received. as published | |
| Growth | 100,000 | 3 nearest published optionsExpand to compare every option and its billing terms. Nearest published volume Nearest published volume Nearest published volume Platform: $138.00/mo 125,000 emails Monthly billing; volume covers emails sent and received. as published | |
| Growth | 250,000 | 3 nearest published optionsExpand to compare every option and its billing terms. Nearest published volume Nearest published volume Nearest published volume Platform: $294.00/mo 300,000 emails Monthly billing; volume covers emails sent and received. as published | |
| Growth | 500,000 | 3 nearest published optionsExpand to compare every option and its billing terms. Nearest published volume Nearest published volume Nearest published volume Platform: $546.00/mo 700,000 emails Monthly billing; volume covers emails sent and received. as published | |
| Growth | 1,000,000 | 3 nearest published optionsExpand to compare every option and its billing terms. Nearest published volume Nearest published volume Nearest published volume Platform: $546.00/mo 700,000 emails Monthly billing; volume covers emails sent and received. as published | |
| Growth | 2,500,000 | 3 nearest published optionsExpand to compare every option and its billing terms. Nearest published volume Basic: $775.00/mo 1,500,000 emails Monthly billing; volume covers emails sent and received. as published Nearest published volume Nearest published volume Platform: $930.00/mo 1,500,000 emails Monthly billing; volume covers emails sent and received. as published |
Postmark: Published plans
1,500,000 emails
Monthly billing; volume covers emails sent and received.
as published
10,000 emails
Monthly billing; volume covers emails sent and received.
as published
50,000 emails
Monthly billing; volume covers emails sent and received.
as published
125,000 emails
Monthly billing; volume covers emails sent and received.
as published
300,000 emails
Monthly billing; volume covers emails sent and received.
as published
700,000 emails
Monthly billing; volume covers emails sent and received.
as published
1,500,000 emails
Monthly billing; volume covers emails sent and received.
as published
How should you compare email costs?
What do the Bird and Postmark price rows include?
Switching cost
What does a Postmark migration involve?
Map Postmark’s send payload and template payload to Bird’s send endpoint. Export suppressions from every Postmark message stream and import them into Bird’s workspace suppressions. The migration guide maps recipient strings, templates, tags and categories.
Postmark’s webhook guide documents HTTP Basic Authentication and IP allowlisting. Add Bird’s Standard Webhooks verification and map RecordType values to Bird events using the migration guide. Test sends and handlers in Bird’s mail sandbox, and plan warm-up when moving onto new dedicated IPs.
Put it into practice.
Continue with the documentation, guides and examples for this topic. Resources are in English.
Where to go next
Start with the migration guide to map the integration and test the cutover.
Talk to our email team
See how Bird fits your Postmark workflow.
Test your sender, templates and delivery events before moving traffic from Postmark. For a larger move, plan the cutover with an email specialist.
Create your account and test your integration. Your migration enquiry will include the provider you are comparing.