Restrict Newsletter lists
diff --git a/erpnext/crm/doctype/newsletter_list/newsletter_list.py b/erpnext/crm/doctype/newsletter_list/newsletter_list.py
index c3604f8..68c445f 100644
--- a/erpnext/crm/doctype/newsletter_list/newsletter_list.py
+++ b/erpnext/crm/doctype/newsletter_list/newsletter_list.py
@@ -89,3 +89,14 @@
 	frappe.msgprint(_("{0} subscribers added").format(count))
 
 	return frappe.get_doc("Newsletter List", name).update_total_subscribers()
+
+def restrict_newsletter_list(doc, method):
+	from frappe.limits import get_limits
+
+	newsletter_list_limit = get_limits().get('newsletter_recipients')
+	if not newsletter_list_limit:
+		return
+
+	nl = frappe.get_doc("Newsletter List", doc.newsletter_list)
+	if nl.get_total_subscribers() >= newsletter_list_limit:
+		frappe.throw(_("Please Upgrade to add more than {0} subscribers").format(newsletter_list_limit))
\ No newline at end of file
diff --git a/erpnext/hooks.py b/erpnext/hooks.py
index 2bb2ca6..0c8de2a 100644
--- a/erpnext/hooks.py
+++ b/erpnext/hooks.py
@@ -136,6 +136,10 @@
 		"validate": "erpnext.shopping_cart.cart.set_customer_in_address"
 	},
 
+	"Newsletter List Subscriber": {
+		"validate": "erpnext.crm.doctype.newsletter_list.newsletter_list.restrict_newsletter_list"
+	},
+
 	# bubble transaction notification on master
 	('Opportunity', 'Quotation', 'Sales Order', 'Delivery Note', 'Sales Invoice',
 		'Supplier Quotation', 'Purchase Order', 'Purchase Receipt',