Mailgun #1 vs Postmark #2 of 3 on /best/transactional-email
Mailgun vs Postmark
Side-by-side plans, pricing, and feature gates for Mailgun and Postmark, verified . Both are primarily transactional email tools.
Plans side by side
Every published plan from each vendor, with the headline monthly anchor price. Some prices scale with subscriber count or seats; full detail lives on each tool's page.
Mailgun
- Free
Hobby tier capped at 100 emails per day
Free - Basic
Entry paid tier with 10,000 emails/month included
$15/mo - Foundation
50,000 emails/month with template builder and full inbound routing
$35/mo - Scale
100,000 emails/month with SAML SSO, dedicated IP, and live support
$90/mo - Enterprise
Custom contracting for high-volume senders
Custom
Postmark
- Free
100 emails per month, no credit card required
Free - Basic
Entry paid tier with 10,000 emails/month and 5 custom domains
$15/mo - Pro
10,000 emails/month with inbound processing and customizable retention
$16.50/mo - Platform
Unlimited domains and users with the lowest overage rate
$18/mo - High-Volume
Custom pricing for volumes above standard tiers
Custom
Limits at the entry paid tier
Compares Basic (Mailgun) against Basic (Postmark). Both are the lowest-priced non-free, non-custom plan on each side.
| Limit | Mailgun | Postmark |
|---|---|---|
| Emails / month | 10,000 | 10,000 |
When Mailgun wins
- Developers integrating receipts, notifications, and password-reset emails
- Teams already on a marketing ESP that need a separate transactional channel
- High-volume B2B applications with strict deliverability requirements
Where Mailgun is the wrong fit
- Marketing teams seeking campaign tooling (use Mailchimp or Kit)
- Creators sending newsletters (use Kit or beehiiv)
- Free-tier hobbyists with low total volume but spiky daily-cap-bumping use cases
When Postmark wins
- SaaS apps prioritizing receipt and notification deliverability
- Teams that need detailed inbound email parsing alongside outbound sends
- Companies that need 365-day data retention for compliance
Where Postmark is the wrong fit
- Hobby projects with bursty traffic (Mailgun's 100/day or Resend's 3,000/month are friendlier than the 100/month Free cap)
- Marketing teams (use Mailchimp or Kit)
- Buyers who want a single vendor for marketing and transactional email
Migrating between these tools 1 guide
Long-form migration guide for this exact pair. Each covers the cost math, what you lose, what you gain, and the pair-specific gotchas that bite during cutover.
Compare across the category
This page is Mailgun vs Postmark. To put both side by side with every other transactional email tool we track on a single price-only table, see the transactional email pricing comparison . Free tiers, entry paid plans, and mid-tier plans for the full transactional email cohort.
Common questions
- Is Mailgun cheaper than Postmark?
- Both Mailgun and Postmark have free or custom entry pricing, so a direct entry-tier price comparison is not meaningful.
- Does Mailgun or Postmark have a free plan?
- Both have free plans. Mailgun: Hobby tier capped at 100 emails per day. Postmark: 100 emails per month, no credit card required.
- Are Mailgun and Postmark in the same category?
- Yes. Both are primarily transactional email tools, which is why this is a natural head-to-head comparison.
- Which has more plans, Mailgun or Postmark?
- Both Mailgun and Postmark ship 5 plans. Tier counts match; the differentiation is in features and pricing structure rather than tier ladder depth.
- Where can I see alternatives to Mailgun or Postmark?
- Each tool has a dedicated alternatives page on TierGauge with ranked options and verified pricing: /alternatives/mailgun for Mailgun and /alternatives/postmark for Postmark. Alternatives are derived from each tool's editor-flagged competitors plus same-category tools we track.
Mailgun: https://www.mailgun.com/pricing/ · Postmark: https://postmarkapp.com/pricing
Last verified . Pricing changes between refreshes; confirm at the vendor before purchasing.