gem 'mailgun_rails'

config.action_mailer.delivery_method = :mailgun
config.action_mailer.mailgun_settings = {
		api_key: '<mailgun api key>',
		domain: '<mailgun domain>'
}

email = mail from: '[email protected]', to: '[email protected]', subject: 'this is an email'
or 
email = mail from: 'Your Name Here <[email protected]>', to: '[email protected]', subject: 'this is an email'

email.mailgun_variables = {name_1: :value_1, name_2: value_2}

email.mailgun_recipient_variables = {'[email protected]' => {id: 1}, '[email protected]' => {id: 2}}

email.mailgun_headers = {foo: 'bar'}

email.mailgun_options = {campaign: '1'}