2010 – Using calculated field to fill an email recipient, subject and body?

I am using calculating field to fill an email field and it does work perfectly for the “recipient” field.

<Field
    ID="{BE6CFDC4-07CF-4175-98E7-E82259A41B5F}"
    Name="myfieldInternalName"
    StaticName="myfieldInternalName"
    DisplayName="my field"
    ResultType="Text"
    Type="Calculated"
    Required="FALSE"
    Group="myGroup">
    <Formula>="mailto:" &amp; mailAdressInternalName</Formula>
    <FieldRefs>      
      <FieldRef Name="mailAdressInternalName"/>
    </FieldRefs>

When I’m clicking, it shows me an outlook “new email” page with the recipient field already filled with the mail adress. (It has probably been setting up to do that). That’s OK.

enter image description here

Now I want to the other fields to be filled too. (i.e. Subject and Body).
How do I do that please ?