Mailgun
Developer-focused transactional email API with strong validation/inspection tooling, recently repriced upward on its pay-as-you-go tier.
Mailgun splits its product into four pieces (Send, Optimize, Validate, and Inspect) aimed at teams that want built-in email verification and deliverability inspection alongside raw sending. A December 2025 price change doubled the pay-as-you-go Flex tier to $2/1,000, weakening its low-volume value proposition relative to competitors.
Pros
- +Built-in email validation and inspection tools beyond just sending
- +SPF/DKIM/DMARC configuration handled, shared IP pools plus dedicated IP on Scale
- +Long-standing developer-API reputation
Cons
- −December 2025 Flex price doubling makes pay-as-you-go meaningfully less competitive
- −Shared-pool deliverability described as average, not premium, without a dedicated IP add-on
Pricing
Free
$0/mo · annual commitment
Month-to-month: not published
- ✓100 emails/day
Foundation
$35/mo · annual commitment
Month-to-month: not published
- ✓50,000 emails/mo
Scale
$90/mo · annual commitment
Month-to-month: not published
- ✓100,000 emails/mo, dedicated IP option
Specifications
| Rating | 3.4 |
| Features | |
|---|---|
| Automation Builder | No |
| Dedicated IP | ✓ |
| A/B Testing | No |
| Source IP allow/deny* | ✓ |
*Source IP allow/deny listing: whether you can restrict which IP addresses may use your sending credentials (SMTP/API), checked against each vendor’s official documentation, 2026-09-01. SendGrid, Mailgun, SMTP2GO and SparkPost offer a native allowlist (no denylist); Amazon SES has no native switch but achieves both allow and deny shapes through IAM policy conditions. Postmark, Resend and Mailjet document no such control.
Researched and drafted with AI assistance; reviewed and approved by Tim Meredith. How we use AI
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