Inbound vs Postmark (2026): which should you pick?
As of Nov 13, 2026, Postmark grades higher than Inbound: 2.2 against 1.8 out of 4.0.
Checked Oct 18, 2026 and Nov 13, 2026 · graded Oct 18, 2026 and Nov 13, 2026 by ToolGPA
Inbound grades higher on value for money. Postmark grades higher on the free plan, features and platforms. They get the same grade on ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
Postmark
Transactional email API and SMTP, with broadcasts on a separate stream
Which one is for you
Pick Inbound if
- Fits if your app needs to receive and answer incoming email
- Works for developers who want email handled by webhook
Look elsewhere if
- Skip it if you want to try it free, since no free plan or trial is listed
- Not for you if you send marketing or bulk email, which the page does not describe
- Tight if you run many domains, with 50 on the $15 plan and $3.50 for each extra
- Watch out: extra capacity is $16 per 50,000 received plus 50,000 sent a month
Pick Postmark if
- Fits if you want password resets kept on a separate stream from your newsletters
- Works for apps that need to look back at exactly what an email said weeks later
Look elsewhere if
- Pricey if you send 50,000 emails a month, at $55 with no yearly discount
- Skip it if you want a free plan to run a small app on, as it's 100 emails a month with no tier until 10,000
- Tight if you're on Basic, with 4 users, 5 sending domains and no inbound email
- Not for you if you want a dedicated IP below 300,000 emails a month, and each one is $50 a month on Pro or higher
- Watch out: DMARC reports are an add-on from $14 a month per domain
How we grade them
| 1.8GPAInboundWeak | 2.2GPAPostmarkFair | |
|---|---|---|
| Value for money | B$9 a month for 5,000 emails is at the edge of the cheaper quarter of email tools. Extra domains are $3.50 each and extra capacity $16 per 50,000. | DGraded on 50,000 emails a month: $55 on Basic or $60.50 on Pro, billed monthly only. That's the dearest in this category at that volume, roughly twice the middle. Bootstrapped companies can ask for $75 of credit. |
| Free plan and trial | FNo free plan and no trial are listed, so every email is paid for from the first one. | CA free developer plan that never expires and needs no card, but it's 100 emails a month with no way to buy more. That's for testing an integration, not running an app. |
| Features | CEmail to webhook, address routing, threaded replies, API and CLI, spam filtering and retries. It does that narrow job fully, and does not describe bulk sending. | BAPI and SMTP with SDKs, separate streams for app and bulk email, inbound email turned into JSON, templates, 45 days of message history and DMARC reports as an add-on from $14 a month. It covers the job; inbound needs Pro. |
| Ease of use | CNo rating on record. It is an API and CLI product, so setup means DNS, webhooks and code. | CJudged on how fast a developer sends a first email: official SDKs, a sandbox mode, ready-made templates for resets and receipts, and migration guides. You'll still verify a domain first. No rating on record. |
| Platforms and integrations | CWeb dashboard, API and CLI only. No integrations list is shown. | BWeb, with an API and SMTP, plus Zapier, WordPress, Stripe, Slack, Supabase, Bubble, Netlify and Datadog. No desktop or phone app, so B is the top. |
| Best for | receiving and replying to email by API | app email kept apart from marketing sends |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Inbound and Postmark. How we grade
Price against what you get
Inbound starts at $9 a month and scores 2.0 out of 4 on features, ease of use and platforms. Postmark starts at $15 a month and scores 2.7.
Postmark scores higher, and starts $6 a month higher: the question is whether the extra is worth that to you. Of the other email sending services on the chart, 8 score higher than Inbound for less, and none scores higher than Postmark for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- Inbound also covers AI agents.
- Postmark also covers dMARC.
At a glance
| Inbound | Postmark | |
|---|---|---|
| Pricing | Paid | Free plan |
| Starts at | $9 per month for 5,000 emails | $15 per month for 10,000 emails |
| Free plan | None | Free developer plan: 100 emails a month with no expiry and no overages, for testing an integration or a small side project. No credit card needed. |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Exon Enterprise LLC | ActiveCampaign, LLC |
| Price read from | inbound.new | postmarkapp.com |
| Checked | Nov 13, 2026 | Oct 18, 2026 |
Worth knowing
Inbound
- There is no free plan or trial listed.
- Extra domains cost $3.50 per domain per month.
- Extra capacity is $16 per 50,000 received plus 50,000 sent a month.
- The product centers on receiving and replying; the pricing page does not describe bulk or marketing sending.
Postmark
- There is no tier between the free 100 emails a month and the 10,000-email paid plans.
- Billing is monthly only; the FAQ says annual plans are not offered yet.
- Basic has no inbound email processing and caps users at 4 and sending domains at 5.
- Dedicated IPs start at $50 a month per IP, need Pro or higher and 300,000 emails a month or more.
Key features
Inbound
- Email to webhook
- Point MX records at the service and received mail is delivered as parsed JSON.
- Address routing
- Route specific addresses or a catch-all to different endpoints.
- Threaded replies
- Reply to a received message in the same thread from the API.
- API and CLI
- One API and a command-line tool cover receiving, parsing and replying.
- Spam filtering
- Choose to reject, flag or accept mail marked as spam.
- Failed delivery retries
- Failed webhook deliveries show in logs and can be retried.
Postmark
- Email API and SMTP
- Send through a REST API with official SDKs or through SMTP, with batch sending, a sandbox mode and migration guides from other providers.
- Message streams
- Transactional and bulk or broadcast email run on separate sending infrastructure, so marketing sends do not affect password resets and receipts.
- Inbound email processing
- Pro and Platform turn incoming email into a JSON object and post it to a webhook URL your app handles.
- Templates
- Responsive templates for welcome emails, password resets and receipts, with a template editor and import tool.
- Message history and analytics
- 45 days of full message content by default, adjustable from 7 to 365 days, with bounce details, open and link tracking and a stats API.
- DMARC monitoring
- DMARC Digests reports show authentication problems and who is sending with your domain, sold as an add-on from $14 a month per domain.
Plans
Inbound
Default$9
per month for up to 5,000 emails
Basic support, with unlimited mailboxes.
Pro$15
per month for up to 50,000 emails
Up to 50 domains.
Growth$39
per month for up to 100,000 emails
Up to 300 domains.
Scale$79
per month for up to 200,000 emails
Unlimited domains.
Postmark
Free$0
100 emails a month, never expires; extra emails cannot be bought on this plan.
Basic$15
per month for 10,000 emails
5 sending domains, 4 users, 45 days of history, no inbound email. Extra emails $1.80 per 1,000; $55 a month at 50,000 emails.
Pro$16.50
per month for 10,000 emails
10 domains, 6 users, inbound email, retention up to 365 days. Extra emails $1.30 per 1,000; $60.50 a month at 50,000 emails.
Platform$18
per month for 10,000 emails
Unlimited domains, servers, streams and users, with inbound email. Extra emails $1.20 per 1,000; $66 a month at 50,000 emails.
High volumeCustom
Custom pricing for large senders, arranged through sales.
Ways to pay less
Inbound
No public discounts listed.
Postmark
- Startups
$75 credit for bootstrapped companies
Companies that have launched, are charging for their product and have taken no outside investment can ask support for $75 of account credit.
Common questions
Which is cheaper, Inbound or Postmark?
As of Nov 13, 2026, Inbound is cheaper to start with: $9 a month, against $15 a month for Postmark. Inbound starts at $9 per month for 5,000 emails, and Postmark starts at $15 per month for 10,000 emails.
Which has a free plan, Inbound or Postmark?
As of Nov 13, 2026, only Postmark has a free plan. Inbound does not.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.