How to know the value of 'email_config' to be used in "/Mail POST" API

Hi Experts,

Need your help in understanding how to get the value of 'email_config' input parameter which is mandatory in "/Mail POST" API.

http://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_7.7/Integration/Web_Services/v10/Endpoin… 

We couldn't find a way to get the value of 'email_config'.

Thanks,

Venkat