Send Email via Web API

Hello,

I'm trying to send an email via the Web Api Action SendEmail (https://msdn.microsoft.com/en-us/library/mt608061.aspx).

The HTTP Post query is pretty simple

/api/data/v8.2/emails(s1264c44-0046-e711-80f8-5061f38se571)/Microsoft.Dynamics.CRM.SendEmail 

with the following JSON content

{"IssueSend": false
}

Put I get a 500 Internal Server Error. The strange thing is if I change "IssueSend" to true (so the mail isn't send to user, but just mark as sent in Dynamics), the query works perfectly well...

Has someone already succeed in sending an email to user through the web api ?

Thanks