I'm trying to bulkify my code, however I'm receiving the following error;"Incompatible element type Messaging.SingleEmailMessage for collection of Opportunity".What do I need to do to amend this so it works? List<Opportunity>emailOpOwner = new list<Opportunity>(); for(Opportunity opp : listOpportunity) { Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage(); mail.setTargetObjectId(opp.OwnerId); mail.setReplyTo('glenn.daly@live.com'); mail.setSenderDisplayName('Salesforce Support'); for(opportunitylineitem oppLineItem :opp.opportunitylineitems) mail.setSubject('Historic Service attached to current opportunity : ' + oppLineItem.Product2.Name); String body = 'Hi '+ opp.Owner.FirstName + ', '; body += '<br><br>Salesforce recognises you as the owner of the following opportunity:'+ opp.Name; for(opportunitylineitem oppLineItem :opp.opportunitylineitems) body += '<br><br>Attached to this opportunity is a former R&D service or project that is no longer available:' + oppLineItem.Product2.Name; body += '<br><br> Please use the link below to view the opportunity record:'; body += '<br><br>test.salesforce.com/'+ opp.id; mail.setHtmlBody(body); mail.setSaveAsActivity(false); Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail }); emailOpOwner.add(mail); update listOpportunity;