Using Send Email (emailauthor.jsp) To Get Around Low Single Email Limits
To mitigate the risk of exceeding Salesforce.com's anemic limit on Apex/API outbound emails, Vicasso has developed an option to leverage the emailauthor.jsp functionality with Email to Case Premium for sending emails. Emails sent through emailauthor.jsp presently have no limit, but this option will not work for all Salesforce organizations and in all scenarios.