I have managed to create an entry not tied to any CRM field, however I would like the EntryType to be EmailText but I can't see to get the syntax right : 

Entry email = new Entry("email");
//email.EntryType = Sage.EntryTypes.EmailText;
email.Caption = "Email address";
email.MaxLength = 255;
email.Size = 255;
eg.Add(email);   

If I try and set the EntryType above it won't let me as the property is marked as read only. What am I doing wrong ?