MailgunTransactional Email API Service For Developers
vs
PostmarkThe email delivery service that people actually like
Comparison · Email Marketing · weekly run Nov 2
Mailgun vs Postmark
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Postmark is the stronger AI pick in Email Marketing: it has a visibility score of 1.9 versus 0.9 for Mailgun.
Choose Mailgun if…
- You need SOC 2 Type II or ISO/IEC 27001 or ISO 27701 or GDPR compliant or HIPAA compliant or PCI-compliant SAQ-A merchant coverage
- recommended for sending larger volumes programmatically
Choose Postmark if…
- You want the brand AI engines rank higher (1.9 vs 0.9)
- You need GDPR coverage
- recommended for transactional email
- suited to reliable transactional email
AI visibility side by side
Latest weekly run · Nov 2
| Metric | Mailgun | Postmark |
|---|---|---|
| Visibility score | 0.9% | 1.9% |
| Change vs last week | New | New |
| Rank in Email Marketing | #36 | #29 |
| Share of voice | 0.2% | 0.9% |
| Mentions this run | 1 | 5 |
| Positive in AI answers | 0% | — |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Mailgun 0pp · Postmark 0pp over 0 weekly runs.
Engine by engine
Postmark leads on 3 of 3 engines
ChatGPT
AI Mode
Perplexity
MailgunPostmark
Head to head in AI answers
0 engine answers name both brands
0Mailgun ranked higher
0Postmark ranked higher
Features, pricing & fit
| Dimension | Mailgun | Postmark |
|---|---|---|
| Pricing model | Usage-based | Usage-based |
| Entry price | Free; paid from $15 / mo | Free; paid from $15 / mo |
| Free plan | Yes | Yes |
| Deployment | Cloud, hosted in US and EU regions | Cloud |
| Compliance | SOC 2 Type II, ISO/IEC 27001, ISO 27701, GDPR compliant, HIPAA compliant, PCI-compliant SAQ-A merchant | GDPR |
| Support | Knowledge Center, Documentation, Ticket support, Chat support on higher plans | Contact form |
| Founded | 2010 | 2010 |
| Employees | 201–500 | — |
| Funding | Growth investment (Thoma Bravo) · $51M raised | — |
| Best for | Developers and engineering teams that need to send transactional and marketing email through an API | Developers and product teams that need reliable transactional email |
Plans side by side
Mailgun
Free$0month
Basic$15month (10,000 emails included)
Foundation$35month (50,000 emails included)
Scale$90month (100,000 emails included)
EnterpriseCustomcustom
Postmark
Free$0month
Basic$15month
Pro$16.5month
Platform$18month
High volumeCustomcustom
Pros and cons
Themes from the AI answers that mention each brand
Mailgun
- recommended for sending larger volumes programmatically
Postmark
- recommended for transactional email
- suited to reliable transactional email
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Mailgun vs Postmark”, https://slateindex.ai/compare/mailgun-vs-postmark, data of Nov 2, 2026. Licence: CC BY 4.0.