Transactional Email · decision tool

Mailgun vs Postmark — for your app, not in general

Mailgun or Postmark? Set your usage, budget and constraints; the verdict, monthly cost and risks update live from verified pricing.

Prices verified 2026-07-15 against official pricing pages · fit weights are our estimates (see methodology) · share the URL to share your configuration

As of Jul 2026, with 20,000 emails/month, a $50 budget for this slot, Mailgun ranks first for these inputs at 91% fit and a StackSays-estimated $33.00/month (Postmark: 89% fit, $29.50/month). Fit weights are our estimates; prices trace to official pages. Change any input below and the verdict recomputes.

Your situation

The verdict updates as you move these.

Emails / month (thousands)20 = 20,000 emails; count receipts, magic links, notificationsBudget for this slot ($/mo)what you'd accept paying for the email provider layerTeam size1 = solo; bundled platforms save glue time for small teams

Toss-up — your priorities decide, not the tools

Mailgunfit 91% · est $33.00/mo

Routing-heavy email API with validations; mid-market workhorse

vs Postmark: fit 91% against 89%, est $33.00 against $29.50 per month — genuinely close; read both risk lists below

Mailgunfit 91%

$33.00/mo

Postmarkfit 89%

$29.50/mo

Comparing 2 tools head-to-head. Open the full field (5 options) →

The decision, in plain words

For a solo builder at 20,000 emails/month and a $50.00/mo budget for the email provider slot, Mailgun leads at 91% fit and $33.00/mo. The two rules doing the work: budget fit (~$33/mo is 66% of your $50/mo budget); batteries included (Bundles marketing email, template tooling, inbound parsing — fewer services to glue at team size 1).

Postmark is a genuine coin-flip here (89% fit, $29.50/mo, $3.50 cheaper) — read both risk lists and pick the failure mode you prefer.

Generated from the calculation above — every number traces to the sourced data; nothing here is written by an AI making things up.

Why Mailgun scores 91%

Budget fit (weight 30, our estimate) — ~$33/mo is 66% of your $50/mo budget+25.2

Batteries included (weight 12, our estimate) — Bundles marketing email, template tooling, inbound parsing — fewer services to glue at team size 1+12

Exit cost (weight 4, our estimate) — Standard SMTP + API — switching providers is a config change plus warmup+3.2

Ecosystem maturity (weight 8, our estimate) — established — our estimate from ecosystem age, docs and hiring pool+8

Free-tier runway (weight 10, our estimate) — Free tier exists (100 emails/day) — a cheap staging/dev lane even after you outgrow it+4

Total (lines sum exactly)52.4

Possible range −64…+64 (sum of active rule weights) · fit % = (total + max) / (2 × max)(52.4 + 64) / 128 = 91%

How the $33.00/mo estimate is calculated

Basic base — includes 10K emails$15.00

emails overage — 10K over 10K included × $1.8/K$18.00

Monthly total (lines sum exactly)$33.00

What could change this verdict

No single input change within the tested range changes the winner.

Cost risk

Estimated now (StackSays estimate, not your final bill)$33.00/mo · Basic

Free-tier statusFree tier exceeded (emails 20K > 3K cap)

Official prices verified 2026-07-15; calculation is deterministic code over those prices.

At a glance

Tool	Free tier	Paid entry	Verified
Postmark	100 emails/month, full features	Basic $15/mo	2026-07-15
Mailgun	100 emails/day	Basic $15/mo	2026-07-15

Where did you land?anonymous, one click

Data sources

Tool	Source	Verified
Postmark	Postmark pricing page	2026-07-15
Mailgun	Mailgun pricing page	2026-07-15

A monitor re-checks these pages for changes; when a vendor moves a price, the date updates and every verdict recomputes.

Keep deciding