Transactional Email · decision tool

Postmark alternatives — ranked for your stack

Leaving Postmark? The other email provider options ranked at your usage, budget and constraints with verified dated pricing — plus when Postmark is still the right call.

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 (Resend: 87% fit, $20.00/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

Narrow pick — the runner-up is close

Mailgunfit 91% · est $33.00/mo

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

vs Resend: fit 91% against 87%, est $33.00 against $20.00 per month

Mailgunfit 91%

$33.00/mo

Resendfit 87%

$20.00/mo

SendGridfit 87%

$19.95/mo

Amazon SESfit 81%

$2.00/mo

Comparing 4 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).

Resend runs close (87% fit, $20.00/mo). It takes the lead if ~$20/mo is 40% of your $50/mo budget matters more to you than the current weights assume.

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

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
Resend	3,000 emails/month (100/day), 1 domain	Pro 50K $20/mo	2026-07-15
Amazon SES	No free tier	Pay-as-you-go — Flat $0.10/1K sent. Free tier is 3K/month for the first 12 months only — not permanent. Dedicated IP $24.95/mo optional	2026-07-15
Mailgun	100 emails/day	Basic $15/mo	2026-07-15
SendGrid	No free tier	Essentials $19.95/mo	2026-07-15

Where did you land?anonymous, one click

Data sources

Tool	Source	Verified
Resend	Resend pricing page	2026-07-15
Amazon SES	Amazon SES pricing page	2026-07-15
Mailgun	Mailgun pricing page	2026-07-15
SendGrid	Third-party 2026 pricing tracker (official page redirect-loops)	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