curl --location --request POST 'https://domain-open-api.getmx.com/v1/smtp-filter/create' \
--form 'token="token"' \
--form 'domain_id="12345678"' \
--form 'group_pay_id="1"' \
--form 'rule="{}"' \
--form 'action="{}"' \
--form 'mark="mark"'
{
"code": 0,
"msg": "string",
"data": null
}