authority letsencrypt {
        api url "https://acme-v02.api.letsencrypt.org/directory"
        account key "/etc/ssl/private/my-acme.key"
}

domain mail.srcbeat.com {
        alternative names { imap.srcbeat.com smtp.srcbeat.com }
        domain key "/etc/ssl/private/mail.srcbeat.com.key"
        domain certificate "/etc/ssl/mail.srcbeat.com.crt"
        domain full chain certificate "mail.srcbeat.com.fullchain.pem"
        sign with letsencrypt
}