[minor] define email field for Issue
diff --git a/erpnext/support/doctype/issue/issue.js b/erpnext/support/doctype/issue/issue.js
index f92e4e6..28617cb 100644
--- a/erpnext/support/doctype/issue/issue.js
+++ b/erpnext/support/doctype/issue/issue.js
@@ -1,4 +1,8 @@
 frappe.ui.form.on("Issue", {
+	"onload": function(frm) {
+		frm.email_field = "raised_by";
+	},
+
 	"refresh": function(frm) {
 		if(frm.doc.status==="Open") {
 			frm.add_custom_button("Close", function() {