ESP Deliverability Report
Updated Apr 1, 2026
Mailgun
Email API for developers
Deliverability Grade
Good email deliverability practices
19%
Primary Inbox
62%
Promotions Tab
17.3%
Avg Spam Rate
Transactional ESP
Platform Type
Shared IPs
Available
Dedicated IPs
Available
IP Warmup Required
Yes
Price Range
Budget-friendly
Dedicated IP Min Volume
Foundation plan and above
Authentication & DMARC Alignment
SPF Auto-Configured
Yes
DKIM Auto-Configured
Yes
Custom Sending Domain
Yes
DMARC Alignment Notes
Mailgun authenticates sending domains with SPF and DKIM during domain verification. DMARC alignment passes when custom domain is set up. Mailgun supports DMARC report aggregation for monitoring.
Deliverability Features
- Inbound email processing
- Email analytics and event tracking
- Geo distribution of sending
- EU and US data center routing
- Suppression list management
Shared IP Reputation
Mailgun shared IPs carry a mixed reputation due to a broad developer user base. New accounts require validation. Shared pool quality is adequate for transactional use — marketing senders see better results on dedicated IPs.
Best For
Inbox Placement Breakdown
Benchmarks based on InboxEagle seed list testing data across ecommerce and SaaS senders. Individual results vary based on list quality, engagement, and domain reputation.
Key Takeaways for Mailgun Senders
Mailgun scores a Grade B with a 17.3% average spam rate and 19% Primary inbox placement.
Configuring a custom sending domain is straightforward — do this before scaling sends.
Dedicated IPs are available from Foundation plan and above. Below this threshold, shared pools offer more established reputation.
See Your Actual Mailgun Inbox Placement
Benchmarks show averages. InboxEagle shows you exactly where your Mailgun emails land — Gmail Primary vs. Promotions vs. Spam — across 20+ mailbox providers after every send.
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