We have a Salesforce org that uses a Salesforce Community. Is there a known security limitation on a Community User executing the Messaging Class SendEmail method in Apex? We are attempting to email a contact via Apex as the Community User.

Any user other than the community user can execute the SendEmail function as found in Apex. 

Please note, the Community user has a special profile that is only accessible via Salesforce Sites. The profile has the needed Apex Access and the following System Permissions are enabled...

• Mass Email
• Send Email

Please advise.