Task Send an Email page ..Send button is not copying the CC email ids

Question

Can any one help me on this ...

We are using the standard functionality of Task "Send an Email page" Send Button for the cases to reply to the customer.When the customers sends a email ,keeping in cc to service team a ticket is raised .when we click on the "Send Email Button" the cc is not getting copied . Any idea or suggestion what may be the issue.

PFA Screen Shot :

Update - VF page constructs URL via controller as:

String redUrl = '/_ui/core/email/author/EmailAuthor?p2_lkid='+
    cas.contactId+
   '&p26='+cas.Email_to‌​_Case_Address__c +
   '&rtype=003&p3_lkid=' +cas.id + 
   '&p4='+cas.Email_CC_Address__c+
   '&p5='+ cas.Email_BCC_Address__c + 
   '&p6='+subject+ '&retURL=/'+ cas.id ;

Portion of VF PAGE :

<apex:page standardController="Case" extensions="CaseCommentAndEmailPageController">
  <apex:form >
            <apex:messages />
           <apex:pageBlock id="abc">
                <apex:pageBlockButtons location="top">
                    <apex:commandLink value="Add Comment" action="{!addComment}" rendered="{!isButtonVisible}" target="_top" styleClass="btn custBtn"/>
                    <apex:commandLink value="Send Email" action="{!sendEmail}"  rendered="{!isButtonVisible}" styleClass="btn custBtn" target="_top" />
                </apex:pageBlockButtons>

            </apex:pageBlock>
        </apex:form>
</apex:page>

Portion of Code:

   public PageReference sendEmail(){
   //old Code
        System.debug('Working.....................');
        if(cas.Email_CC_Address__c == null || cas.Email_CC_Address__c == 'null'){
             System.debug('cas.Email_CC_Address__c = '+cas.Email_CC_Address__c);
            cas.Email_CC_Address__c ='';
        }
        if(cas.Email_BCC_Address__c == null || cas.Email_BCC_Address__c == 'null'){
            System.debug('cas.Email_BCC_Address__c = '+cas.Email_BCC_Address__c);
            cas.Email_BCC_Address__c ='';
        }
        System.debug('cas.CaseNumber = '+cas.CaseNumber);
        System.debug('cas.Subject = '+cas.Subject);
        String subject = cas.CaseNumber+' - '+cas.Subject;
        if(subject.length() >= 100){
            subject = subject.subString(0,99);
            System.debug('Sub cas.Subject = '+subject);
        }
        String redUrl = '/_ui/core/email/author/EmailAuthor?p2_lkid='+cas.contactId+'&p26='+cas.Email_to_Case_Address__c +'&rtype=003&p3_lkid=' +cas.id +
                         '&p4='+cas.Email_CC_Address__c+'&p5=' + cas.Email_BCC_Address__c + '&p6='+subject+     
                        '&retURL=/'+ cas.id ;
        System.debug('redUrl = '+redUrl );
        PageReference pageRef = new PageReference('/_ui/core/email/author/EmailAuthor');
         System.debug('End.....................');
         pageRef.getParameters().put('p2_lkid',cas.contactId);
         pageRef.getParameters().put('p26',cas.Email_to_Case_Address__c);
         pageRef.getParameters().put('rtype','003');
         String caseId = cas.id;
         if(caseId != null && caseId.length() > 15){
             pageRef.getParameters().put('p3_lkid',caseId.subString(0,15));
         }
         pageRef.getParameters().put('p4',cas.Email_CC_Address__c);
         pageRef.getParameters().put('p5',cas.Email_BCC_Address__c);
         pageRef.getParameters().put('p6',subject);
         pageRef.getParameters().put('retURL',cas.id);
       // pageRef.setRedirect(true);
        return pageRef;
    }

Any help very much appreciated.

Answer 1

Sorry for the delay

This can be done without a VF controller as follows (Here I used a custom object Foo__c rather than Case as I didn't want to mess up my Dev Edition Case):

<apex:page standardController="Foo__c" extensions="FooExtensions">
    <apex:form >
        <apex:variable var="vContact" value="{!Foo__c.contact__c}"/>
        <apex:variable var="vTo" value="{!Foo__c.to__c}"/>
        <apex:variable var="vCc" value="{!Foo__c.cc__c}"/>
        <apex:variable var="vBcc" value="{!Foo__c.bcc__c}"/>
        <apex:variable var="vName" value="{!Foo__c.name}"/>
    <apex:pageMessages />
       <apex:pageBlock id="abc">
        <apex:pageBlockButtons location="top">
         <apex:commandButton value="New Comment"
            rendered="{!isButtonVisible}" styleClass="btn custBtn"
            action="{!URLFOR('00a/e',null,
                              'parent_id'=Foo__c.id,
                              'retURL'='/'+Foo__c.id)}"/>  
         <apex:commandButton value="Send Email" 
            rendered="{!isButtonVisible}" styleClass="btn custBtn"
            action="{!URLFOR('/_ui/core/email/author/EmailAuthor',$ObjectType.Task,[
                             'p2_lkid'=Foo__c.contact__c,
                             'p26'=Foo__c.to__c,
                             'rtype'='003',
                             'p3_lkid'=Foo__c.id,
                             'p4'=Foo__c.cc__c,
                             'p5'=Foo__c.bcc__c,
                             'p6'=Foo__c.name,
                             'retURL'='/'+foo__c.id                          
                                                       ])}"/>
      </apex:pageBlockButtons
    </apex:pageBlock>

    ... rest of page ...
    </apex:form>
</apex:page>

Notes

1. The apex:variable are needed to fetch values for the various to, cc, bcc, subject, ... fields from the controller for use in the URLFOR. If your VF page already has these fields elsewhere on the page, the apex:variable is not necessary.
2. The URLFOR creates the redirect to the new Task Send an Email page. If you are not familiar with URLFOR, its syntax can sometimes be confusing. Just like any other VF function, everything within a {!..} is either an expression of constants and/or merge fields. What is sometimes confusing is the URLFOR third parameter, labeled inputs in the VF doc without any examples (!?!). This third parameter syntax is expression=expression

If, for some reason, you have to use a Controller, then be sure that you include the <apex:variable> on your page for any field needed by the controller in your expression for redUrl.