To use any of the above modules, you need to connect your Mailgun account to Integromat. If you do not have a Mailgun account yet, you can create one at Mailgun.com account.
To connect your Mailgun account to Integromat, follow the general instructions for Connecting to services. While creating the connection, you will be prompted to enter your Mailgun API key. To find the key, go to the domains section of the Mailgun control panel and choose the requested domain. The API key is displayed on the domain's page.
If you want to use webhooks in your scenarios, you need to set a URL for each type of webhook in the Webhooks section of the Mailgun control panel.
For more information, please read the Webhooks section.
If you use sandbox (if you haven't set up any domain) and want to send emails, you need to verify recipients' email addresses in your Mailgun account's settings first.
For more information, please read the Mailgun documentation.
If you send emails from a verified domain, the email address of the sender must include this domain. If you use, for example, a domain @example.com, you can set up firstname.lastname@example.org ( but not email@example.com) as the sender email address.