Two services with the same $15 entry plan and the same 10,000 emails inside it. They part on what happens above that, on whether mail comes in as well as goes out, and on which plan carries a written SLA. This page reads both pricing pages and puts the figures side by side; Notix appears as a third column, not as the subject.
Postmark's figures were read from its pricing page on 2026-09-13 and Mailgun's from its pricing page on 2026-09-13; both dates are repeated under the table. Notix figures come from its own pricing page.
| Criterion | Postmark | Mailgun | Notix |
|---|---|---|---|
| Free tier | 100 emails a month on the developer plan | 100 emails a day, one inbound route | 5,000 emails a month, 200 a day, no card, no end date |
| Entry paid plan | Basic $15 a month | Basic $15 a month | Pro $15 a month |
| Included on that plan | 10,000 emails a month, then $1.80 per extra 1,000 | 10,000 emails a month (Foundation: $35 for 50,000) | 50,000 emails, usage past that metered on the same invoice |
| SMTP relay | Yes, on every plan | Yes, on every plan | Yes, on every plan |
| SDKs | Node, Python, Ruby, PHP, .NET, and a documented cURL surface | Node, Python, PHP, Ruby, Go, Java, C# | TypeScript, Python, Go, PHP |
| Webhooks | Yes | Yes | Yes, signed, for email, contact and domain events |
| OTP / verification API | No | No | Yes, email and SMS codes |
| Deliverability check before sending | No | Email validation as an add-on ($1.80 per 1,000 on Basic; 5,000 included from Foundation) | Yes, a pre-send check API |
| Billing outside USD | USD by card | USD by card | USD by card; naira and shillings from a prepaid wallet |
| SLA | Not stated on the pricing page | Stated for Scale and above | 99.9% on Pro, credits on the pricing page |
| Prices and limits read from the vendors' own pages: postmarkapp.com on 2026-09-13; www.mailgun.com on 2026-09-13. Notix figures are from its own pricing page. | |||
Mailgun's free plan is 100 emails a day, about 3,000 a month, with one inbound route. Postmark's developer plan is 100 emails a month. Both are sized for integrating and testing; Mailgun's is the only one that could carry a small side project without a bill. Neither free tier is a place to run production volume.
At 10,000 emails the two are identical: $15 a month on either Basic plan. At 50,000, Mailgun moves you to Foundation at $35, while Postmark Basic stays at $15 plus $1.80 for each of the 40 extra thousand, about $87, unless you step up a Postmark plan. The lines cross a little over 21,000 emails a month. Below that Postmark's metered overage is the gentler slope; above it Mailgun's plan ladder is cheaper.
Both take a JSON body with from, to, subject and html and return a message id, and both offer an SMTP relay on every plan, so a framework mailer or an application you would rather not touch can send without the API. A plain transactional send moves between the two after a client swap and a credential change. Mailgun also receives: inbound routes accept mail for your domain and post it to your application. Postmark's pricing page compared here covers sending only.
Mailgun lists Node, Python, PHP, Ruby, Go, Java and C#. Postmark lists Node, Python, Ruby, PHP and .NET, with a documented cURL surface for everything else. Node, Python, PHP and Ruby teams get a typed client from both; Go and Java teams get one from Mailgun only, and the two name the .NET client differently but both ship one. For the languages both cover, the choice will not rest on the client.
Both deliver event webhooks for delivery, bounce and complaint events, so a bounced address can be marked in your own database. Mailgun sells address validation as an add-on, $1.80 per 1,000 checks on Basic and 5,000 a month included from Foundation; Postmark lists no validation product. Neither offers a one-time-code API, and neither offers a deliverability check you can call before a send.
Both bill in US dollars by card. Mailgun states an SLA for Scale and above, which begins at $90 a month; Postmark's pricing page does not state an SLA figure. Neither $15 plan carries a written uptime commitment. If one is a requirement, Mailgun's Scale plan meets it and Postmark's pricing page, as read here, does not say.
On the same criteria: Notix Free is 5,000 emails a month and 200 a day with no card and no end date. Pro is $15 a month for 50,000 emails, with usage past that metered on the same invoice: the same entry price as both headline services with five times the volume inside it, and no plan ladder at 50,000. SMTP, webhooks and SDKs for TypeScript, Python, Go and PHP are on every plan. Notix does not receive mail, so Mailgun's inbound routes stay a reason to pick Mailgun. Where it differs is on the rows the other two leave empty: a verification API for one-time codes by email or SMS, a deliverability check you call before a send, a 99.9 percent commitment on the $15 plan, and billing from a naira or shilling wallet as well as by card.
Five times the included volume at the same $15, with the marketing side and an OTP API in the same account.
AlternativesSame $15 entry, 50,000 emails instead of 10,000, and a suppression list shared across transactional and marketing.
CompareTen thousand emails for $15 against fifty thousand, and the one thing Postmark has that Notix does not claim.
CompareSame $15 entry, different included volume, and where Mailgun's inbound routing and validation matter.
CompareEvery vendor in one table with read dates, and a straight answer to which transactional email API a startup should pick.
NotixA free plan with no card, and Pro at $15 a month for 50,000 emails. Only sent volume is metered.
5,000 emails a month on Free, no card, no end date. Pro is $15 for 50,000 emails.