Email Service Provider

Mailgun

A developer-focused email API for transactional email with advanced routing and analytics.

⚡ Monitored by EmailExacto Intelligence

Overview

What is Mailgun?

Mailgun is an email service provider (ESP) that handles sending infrastructure, IP reputation management, and delivery feedback for email campaigns, transactional messages, or both. Their sending reputation and your domain's authentication configuration are the two primary drivers of inbox placement when using Mailgun.

Mailgun authenticates sending domains via DNS records including DKIM CNAME records and an SPF include:mailgun.org. Both shared and dedicated IPs are available. Domain verification is required before sending.

Technical Details

How It Works

When you send through Mailgun, messages leave via their SMTP servers or API. The receiving server sees Mailgun's sending IPs in the Received headers. For your domain to pass DMARC, you must configure Mailgun's DKIM keys and SPF include: in your DNS. Without this, email sent through Mailgun fails authentication for your domain.

Mailgun provides comprehensive webhook support for all email events and an email validation API for list hygiene. Their Routes feature allows advanced inbound email handling.

Deliverability Impact

Why It Matters

Your ESP affects deliverability through their shared IP pool quality, feedback loops and bounce handling, and ease of authentication configuration. Mailgun is well-regarded for developer integrations and transactional sending. Dedicated IPs are available for higher-volume accounts.

Regardless of ESP, the fundamentals are yours to control: domain authentication, list hygiene, engagement rates, and complaint rates have more long-term deliverability impact than the ESP choice itself.

EmailExacto

How EmailExacto Helps

Monitor Your Mailgun Domain with EmailExacto

EmailExacto Intelligence monitors your sending domain independently of your ESP — giving you visibility into authentication, blacklist status, and inbox placement regardless of which platform you send through.

SPF, DKIM, and DMARC monitoring — verify Mailgun's authentication is correctly configured for your domain
Blacklist monitoring — detect if your domain or IP has been listed
Inbox placement testing — see where your email lands at Gmail, Outlook, and Yahoo
Daily deliverability score — track domain health independently of your Mailgun dashboard

See EmailExacto Intelligence →

Best Practices

What to Get Right

✓Complete domain verification in Mailgun — add all required DNS records before sending.

✓Set up Mailgun webhooks for bounces and unsubscribes to maintain list hygiene.

✓Use Mailgun's email validation API to clean your list before large sends.

✓Monitor sending stats — high temporary failure rates indicate reputation issues.

✓Use separate Mailgun sending domains for different mail streams.

✓Configure DMARC and point rua= to a monitored mailbox.

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