curl --location '/SOAP?service=EasyIPAdmin' \
--header 'SOAPAction: urn:EasyIPLibrary-EasyIPAdmin#EmailUsers' \
--header 'Content-Type: text/xml; charset=utf-8' \
--data '<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<tns:EasyIPAdmin___EmailUsers xmlns="http://tempuri.org/">
<tns:UserIds/>
<tns:Subject>string</tns:Subject>
<tns:MessageBody>string</tns:MessageBody>
</tns:EasyIPAdmin___EmailUsers>
</soap:Body>
</soap:Envelope>'