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Mailgun

Mailgun is a reliable email delivery service. Entrig connects to Mailgun using your API key and sends emails from your active sending domain.

What you’ll need

  • A Mailgun account
  • An active sending domain in Mailgun (sandbox domains only send to authorized recipients; use a verified custom domain for production)
  • A Mailgun API key, found in Mailgun under Settings → API Keys → Private API key

Configure

  1. Open Channels → Email in Settings

    From the Entrig dashboard, go to Settings → Channels. Under the Email section, find Mailgun and click Configure.

  2. Enter your API key and select region

    Paste your Mailgun Private API key. Choose US or EU to match where your Mailgun account is hosted. EU accounts use api.eu.mailgun.net.

  3. Click Connect

    Entrig fetches your active domains from Mailgun. If no active domains are found, you can enter your domain and From address manually.

  4. Select a domain

    Choose an active domain from the dropdown. Only domains with active state are shown.

  5. Set the From address

    Enter the email address notifications will be sent from (e.g. notifications@yourdomain.com). It must use the domain you selected.

  6. Set the From name (optional)

    Enter a display name that recipients will see (e.g. My App).

  7. Save

US vs EU region

Mailgun operates two independent API endpoints:

RegionAPI endpoint
USapi.mailgun.net
EUapi.eu.mailgun.net

Your account and domains are tied to one region. Using the wrong region returns a 401 error even if your API key is correct.

Troubleshooting

”No active domains found”

Cause: You are using a Mailgun sandbox domain, all your domains are unverified, or you selected the wrong region.

Fix: Check your domain status in the Mailgun dashboard under Sending → Domains. Make sure you have completed DNS verification and that the region selected in Entrig matches your account region.

Emails going to spam

Cause: SPF and DKIM records are missing or not yet propagated for your domain.

Fix: In the Mailgun dashboard, open your domain settings and complete all DNS verification steps. A domain showing a green “Active” status has all required records in place.

”Mailgun API error: 401”

Cause: Wrong API key or wrong region selected.

Fix: Double-check that you are using the Private API key (not a public key) and that the region matches your Mailgun account region.

”Mailgun API error: 404”

Cause: The domain selected no longer exists or was deleted from Mailgun.

Fix: Reconfigure the channel and select a valid active domain.