Add your Mailgun API key to LeadJabber

2 min readChecked against LeadJabber 24 October 2026

Short answer

In LeadJabber, open the Getting started menu and click Connect your email delivery provider. Choose Mailgun, paste your Mailgun API key and click Continue. If the setup is already complete, click your name in the top right corner, choose Email provider, select Mailgun, enter the key and click Save.

Before you begin

You need a Mailgun account API key. If you do not have one, follow Create an API key in Mailgun first. The API key is the only thing LeadJabber asks for. LeadJabber then finds out whether your domain uses the US or EU region and sets up the webhooks it needs in your Mailgun account automatically, so it can follow events such as opens, clicks and bounces.

Add the key in Getting started

  1. In LeadJabber, open the Getting started menu and click Connect your email delivery provider.

  2. Choose Mailgun.

  3. Paste your Mailgun API key into the field and click Continue.

  4. LeadJabber verifies the key. When it is accepted, you see a confirmation.

Add the key after the setup is complete

The Getting started menu disappears when the setup is complete. Then add or change the key here:

  1. Click your name in the top right corner and choose Email provider under Configuration.

  2. In Email Provider Configuration, choose Mailgun under Email Provider.

  3. Enter the key under API Key. Click the lock icon next to the field if it is locked.

  4. When the field shows API key verified and working, click Save.

See also Change your email provider or API key.

Next step

Before you send, authenticate your domain in Mailgun. Mailgun only sends for domains that are verified in your account.

When to contact support

Contact us if the key is rejected even though it is an account API key with the Developer role. Email support@leadjabber.com with a screenshot of the error. Never send the key itself.

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