Send Email using Apex and save as Activity
// Create an email message objectMessaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();String emailAddress = (String) obj.get(‘Email’);// String[] toAddresses = new String[] {obj.Email};String[] toAddresses = new String[] {emailAddress};/*mail.setToAddresses(toAddresses);mail.setSubject(subject);mail.setHtmlBody(body);mail.setWhatId(c.Id);*/mail.setTemplateId(templateId);mail.setTargetObjectId(obj.Id);