Insufficient Privileges, cannot send email in force.com free edition.
I've checked the document and it is said that with the "Send Email" permission, user can send email by click Send An Email on the Activity History related list of a record.
I'm using an user with the "Send Email" permission enabled. The user license is force.com free. I clicked the "Send an Email" button on one of the custom record and got the "Insufficient Privileges" error.
Following are the details form the help document. Thanks!
Available in: All Editions except Database.com
User Permissions Needed
To send emails:
To create an organization-wide address:
“Modify all Data”
To send email to a contact, lead, person account, or other user:
- Click Send An Email on the Activity History related list of a record. Or, from a case, click Send An Email or Reply from the Email related list. This option is available only to organizations using Email-to-Case or On-Demand Email-to-Case.