it should be replacement of `@semic/plugin-email`
it should be replacement of @semic/plugin-email
``shell``
MAILGUN_SMTP_HOST='smtp.mailgun.org'
MAILGUN_SMTP_AUTH_USER='postmaster@xxx.com'
MAILGUN_SMTP_AUTH_PASS='xxxxx'
MAILGUN_API_KEY='key-xxxx'
MAILGUN_API_DOMAIN='xxx.domain.com'