diff --git a/frappe/__init__.py b/frappe/__init__.py
index 5be47fa47f..cdce7629eb 100644
--- a/frappe/__init__.py
+++ b/frappe/__init__.py
@@ -13,7 +13,7 @@ import os, sys, importlib, inspect, json
 from .exceptions import *
 from .utils.jinja import get_jenv, get_template, render_template
 
-__version__ = '8.0.62'
+__version__ = '8.0.63'
 __title__ = "Frappe Framework"
 
 local = Local()
diff --git a/frappe/email/queue.py b/frappe/email/queue.py
index c153a3cec6..23a549d6e2 100755
--- a/frappe/email/queue.py
+++ b/frappe/email/queue.py
@@ -456,10 +456,22 @@ def prepare_message(email, recipient, recipients_list):
 
 def clear_outbox():
 	"""Remove low priority older than 31 days in Outbox and expire mails not sent for 7 days.
-
-	Called daily via scheduler."""
-	frappe.db.sql("""delete q, r from `tabEmail Queue` as q, `tabEmail Queue Recipient` as r where q.name = r.parent and q.priority=0 and
-		datediff(now(), q.modified) > 31""")
-
-	frappe.db.sql("""update `tabEmail Queue` as q, `tabEmail Queue Recipient` as r set q.status='Expired', r.status='Expired'
-		where q.name = r.parent and datediff(curdate(), q.modified) > 7 and q.status='Not Sent' and r.status='Not Sent'""")
+	Called daily via scheduler.
+	Note: Used separate query to avoid deadlock
+	"""
+	
+	email_queues = frappe.db.sql_list("""select name from `tabEmail Queue` 
+		where priority=0 and datediff(now(), modified) > 31""")
+	
+	if email_queues:
+		frappe.db.sql("""delete from `tabEmail Queue` where name in (%s)""" 
+			% ','.join(['%s']*len(email_queues)), tuple(email_queues))
+	
+		frappe.db.sql("""delete from `tabEmail Queue Recipient` where parent in (%s)""" 
+			% ','.join(['%s']*len(email_queues)), tuple(email_queues))
+		
+	for dt in ("Email Queue", "Email Queue Recipient"):
+		frappe.db.sql("""
+			update `tab{0}` 
+			set status='Expired'
+			where datediff(curdate(), modified) > 7 and status='Not Sent'""".format(dt))
\ No newline at end of file
diff --git a/frappe/email/receive.py b/frappe/email/receive.py
index 33aa9c2d0b..0ff632771e 100644
--- a/frappe/email/receive.py
+++ b/frappe/email/receive.py
@@ -174,7 +174,9 @@ class EmailServer:
 			email_list = []
 			self.check_imap_uidvalidity()
 
-			self.imap.select("Inbox", readonly=True)
+			readonly = False if self.settings.email_sync_rule == "UNSEEN" else True
+
+			self.imap.select("Inbox", readonly=readonly)
 			response, message = self.imap.uid('search', None, self.settings.email_sync_rule)
 			if message[0]:
 				email_list =  message[0].split()
@@ -261,14 +263,16 @@ class EmailServer:
 				if not cint(self.settings.use_imap):
 					self.pop.dele(msg_num)
 				else:
-					# mark as seen
-					self.imap.uid('STORE', message_meta, '+FLAGS', '(\\SEEN)')
+					# mark as seen if email sync rule is UNSEEN (syncing only unseen mails)
+					if self.settings.email_sync_rule == "UNSEEN":
+						self.imap.uid('STORE', message_meta, '+FLAGS', '(\\SEEN)')
 		else:
 			if not cint(self.settings.use_imap):
 				self.pop.dele(msg_num)
 			else:
-				# mark as seen
-				self.imap.uid('STORE', message_meta, '+FLAGS', '(\\SEEN)')
+				# mark as seen if email sync rule is UNSEEN (syncing only unseen mails)
+				if self.settings.email_sync_rule == "UNSEEN":
+					self.imap.uid('STORE', message_meta, '+FLAGS', '(\\SEEN)')
 
 	def get_email_seen_status(self, uid, flag_string):
 		""" parse the email FLAGS response """