Yes! In the Send Email action there are fields for both an HTML body and Plain Text body of the email message.
We currently don't have attachment support for Mailgun at this point in time, but will hopefully be able to add that kind of functionality in the future.
If you're using an EU region Mailgun account, your account isn't currently supported on Zapier at this time.
- Check if you have verified your phone number with Mailgun. This is needed to use the API
- Check if allowing is enabled with the Mailgun account, this blocks unauthorized access including to the API