In-depth two-product comparison
SendGrid vs Mailgun
In-depth comparison of SendGrid and Mailgun for B2B SaaS companies. We analyze API quality, deliverability, pricing, features, and real-world use cases.
Last updated: 2026-03-15. Verify current features, pricing, limits, and integrations on official vendor pages.
Short answer
SendGrid wins on scale, marketing features, integration ecosystem, and track record. Mailgun wins on email validation and inbound email routing flexibility. Both are established platforms with similar core capabilities. Sequenzy is the strongest choice if your SaaS needs lifecycle email with native billing integration for trial conversion, dunning, and churn prevention.
SendGrid
The industry standard for email at scale with marketing and transactional
Mailgun
The developer email platform with SMTP, inbound, and validation
Quick comparison
| Decision area | SendGrid | Mailgun | What to verify |
|---|---|---|---|
| Best For | Enterprise-scale email with marketing campaigns | Developer teams needing SMTP, inbound, and validation | Test this with representative data and the next realistic usage tier. |
| Starting Price | Free (100 emails/day) | $35/mo for 50,000 emails | Test this with representative data and the next realistic usage tier. |
| Deliverability | 15+ years of IP reputation management | Variable shared IP quality | Test this with representative data and the next realistic usage tier. |
| Marketing Campaigns | Full campaign builder (paid add-on) | Not available | Test this with representative data and the next realistic usage tier. |
| Email Validation | Available as paid add-on | Mailgun Optimize built-in validation | Test this with representative data and the next realistic usage tier. |
| Inbound Email | Inbound parse webhook | Full inbound routing and parsing | Test this with representative data and the next realistic usage tier. |
| SMTP Support | Full SMTP relay | Full SMTP with flexible routing | Test this with representative data and the next realistic usage tier. |
| Log Retention | 30+ days on all plans | 5-30 days depending on plan | Test this with representative data and the next realistic usage tier. |
| Payment Integration | None | None | Test this with representative data and the next realistic usage tier. |
| Dedicated IP | Available on Pro ($89.95/mo) | Available on Scale ($90/mo) | Test this with representative data and the next realistic usage tier. |
| SDK Languages | 7 official SDKs | 7 official SDKs | Test this with representative data and the next realistic usage tier. |
Feature comparison
| Feature | SendGrid | Mailgun |
|---|---|---|
| Send speed | 8/10 Reliable with occasional latency | 7/10 Decent speed, some variance |
| Template system | 7/10 Handlebars dynamic templates with visual editor | 5/10 Handlebars templates via API, no visual editor |
| Bounce handling | 8/10 Auto-suppression with management | 7/10 Bounce processing with suppression |
| Email routing | 6/10 Standard SMTP relay | 9/10 Flexible routing rules for complex workflows |
| Attachments | 9/10 Up to 30MB with inline support | 8/10 Up to 25MB with inline support |
| Campaign builder | 8/10 Full drag-and-drop builder in Marketing Campaigns | 0/10 Not available |
| A/B testing | 8/10 Subject line and content testing | 0/10 Not available |
| Automation | 6/10 Basic automation in Marketing Campaigns | 0/10 Not available |
| Contact management | 7/10 Contact lists with segmentation | 3/10 Mailing lists via API |
| Unsubscribe management | 8/10 Group unsubscribes and preferences | 6/10 Basic unsubscribe handling |
| API design | 6/10 Functional but v2/v3 inconsistencies | 6/10 Functional but dated in areas |
| Documentation | 7/10 Comprehensive but dense | 6/10 Adequate but hard to navigate |
| SDK quality | 7/10 Official SDKs, some feel auto-generated | 6/10 Official SDKs, some dated |
| Email validation | 5/10 Available as paid add-on | 9/10 Mailgun Optimize with real-time and bulk validation |
| Inbound processing | 6/10 Inbound parse webhook | 8/10 Full inbound routing with flexible rules |
| IP reputation | 8/10 15+ years of reputation management | 6/10 Variable shared IP quality |
| Dedicated IP | 8/10 Available on Pro with warmup tools | 7/10 Available on Scale plan |
| Domain auth | 7/10 SPF, DKIM, DMARC with link branding | 7/10 SPF, DKIM, DMARC, tracking domain |
| Scale capacity | 10/10 Proven at billions per month | 8/10 Handles high volume well |
| Compliance | 9/10 Full CAN-SPAM, GDPR, unsubscribe headers | 7/10 Basic compliance tools |
| Billing integration | 0/10 Not available | 0/10 Not available |
| Lifecycle sequences | 4/10 Basic automation in marketing add-on | 0/10 Not available |
| Dunning emails | 2/10 Build with API | 0/10 Not available |
| Trial conversion | 2/10 Build custom workflow | 0/10 Not available |
| Revenue attribution | 0/10 Not available | 0/10 Not available |
Pricing and operating cost
SendGrid
Free: 100 emails/day
Marketing Campaigns is a separate add-on Email validation costs extra Dedicated IP add-on on lower plans
Mailgun
Free trial, then $35/mo
Email validation (Mailgun Optimize) is a separate add-on Log retention limited to 5 days on starter Dedicated IP costs extra on lower plans IP pool management fees
| Tier or usage case | SendGrid | Mailgun |
|---|---|---|
| Starter | $19.95/mo 100,000 emails, basic analytics | $35/mo 50,000 emails, 5 days log retention |
| Growth | $89.95/mo 500,000 emails, dedicated IP, phone support | $90/mo 100,000 emails, dedicated IP, 15 days log retention |
| Scale / Pro | $249.95+/mo 1M+ emails, SLA, SSO, dedicated IP pool | $350+/mo 500K+ emails, 30 days log retention, SLA |
Pros and cons
SendGrid
Pros
- Proven at billions of emails per month
- Marketing Campaigns with campaign builder and automation
- Largest integration ecosystem
- Enterprise SLAs backed by Twilio
- Better shared IP reputation than Mailgun
- Full SMTP relay support
- 30+ days log retention on all plans
- Official Salesforce integration
Cons
- API design feels dated
- Dashboard can be complex
- Marketing Campaigns is a paid add-on
- Support quality reportedly declined post-acquisition
- Complex pricing with add-ons
- No SaaS-specific features
- Inbound email less flexible than Mailgun
- Email validation less robust than Mailgun Optimize
Mailgun
Pros
- Best-in-class email validation with Mailgun Optimize
- Flexible inbound email routing and parsing
- Strong SMTP relay with routing rules
- Action Mailer support for Rails
- Tag-based analytics for categorization
- Batch sending with recipient variables
- Good Python SDK
- Flexible email routing API
Cons
- Shared IP reputation can be inconsistent
- No marketing campaign features
- Limited log retention on lower plans (5 days)
- API documentation can be hard to navigate
- SDKs feel less polished
- Multiple ownership changes create uncertainty
- No SaaS lifecycle or billing features
- Higher per-email cost than SendGrid at similar volume
Who should choose what?
Startup needing email infrastructure fast.
Recommendation: Mailgun
Need campaign management alongside transactional.
Recommendation: SendGrid
High-volume signups requiring email verification.
Recommendation: Mailgun
Self-serve signups with billing-aware lifecycle email.
Recommendation: Mailgun
Sending millions monthly at scale.
Recommendation: SendGrid
Ruby on Rails with Action Mailer setup.
Recommendation: Mailgun
Final verdict
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FAQ
Is SendGrid more reliable than Mailgun?
SendGrid generally has better deliverability and more consistent shared IP reputation. Mailgun shared IPs have varied. For both platforms, a dedicated IP improves reliability. SendGrid has a longer track record (15+ years) and handles more volume globally.
Does Mailgun have better email validation than SendGrid?
Yes. Mailgun Optimize is a more mature and comprehensive email validation service. SendGrid offers validation as an add-on but it is not as feature-rich as Mailgun Optimize, which provides real-time and bulk validation with detailed risk assessment.
Which is cheaper for 100K emails per month?
SendGrid costs $89.95/mo for up to 500K emails. Mailgun costs $90/mo for 100K emails. At this volume, SendGrid gives you more emails per dollar. Sequenzy at $49/mo gives you 50K emails with lifecycle features included.
Can I use both SendGrid and Mailgun together?
Yes, some teams use SendGrid for marketing/transactional sending and Mailgun for inbound email processing or email validation. This adds complexity but leverages each platform strengths.
Related reading: B2B email marketing guide, alternatives hub, and B2B SaaS tool stack.