Using MailGun in GrooveMail
Step 2: Once you land on dashboard, you can add your domain or subdomain.
Step 3: Click on domain name and you will be directed to Overview page, here you can grab your SMTP credentials (username and password) and plug them into your app’s settings.
Step 4: On the same page there is menu item named "API Keys" on the right, clicking on it will redirect you to a page where you can fetch the "HTTP webhook signing key".
Step 5: Click on "Webhooks" option from left side menu you will be redirected to Webhooks page:
Step 6: Fill all the entries and create the sender.