diff --git a/frappe/email/doctype/email_account/email_account.py b/frappe/email/doctype/email_account/email_account.py
index 53cb6b8dd7..5cc56027fc 100755
--- a/frappe/email/doctype/email_account/email_account.py
+++ b/frappe/email/doctype/email_account/email_account.py
@@ -457,8 +457,8 @@ class EmailAccount(Document):
 				# try and match by subject and sender
 				# if sent by same sender with same subject,
 				# append it to old coversation
-				subject = frappe.as_unicode(strip(re.sub("(^\s*(Fw|FW|fwd)[^:]*:|\s*(Re|RE)[^:]*:\s*)*",
-					"", email.subject)))
+				subject = frappe.as_unicode(strip(re.sub("(^\s*(fw|fwd|wg)[^:]*:|\s*(re|aw)[^:]*:\s*)*",
+					"", email.subject, 0, flags=re.IGNORECASE)))
 
 				parent = frappe.db.get_all(self.append_to, filters={
 					self.sender_field: email.from_email,