diff --git a/data/Dockerfiles/dovecot/quarantine_notify.py b/data/Dockerfiles/dovecot/quarantine_notify.py
index b1af332a..75b3c710 100755
--- a/data/Dockerfiles/dovecot/quarantine_notify.py
+++ b/data/Dockerfiles/dovecot/quarantine_notify.py
@@ -1,11 +1,11 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 import smtplib
 import os
 import mysql.connector
-from email.MIMEMultipart import MIMEMultipart
-from email.MIMEText import MIMEText
-from email.Utils import COMMASPACE, formatdate
+from email.mime.multipart import MIMEMultipart
+from email.mime.text import MIMEText
+from email.utils import COMMASPACE, formatdate
 import cgi
 import jinja2
 from jinja2 import Template
@@ -20,7 +20,7 @@ while True:
     r = redis.StrictRedis(host='redis', decode_responses=True, port=6379, db=0)
     r.ping()
   except Exception as ex:
-    print '%s - trying again...'  % (ex)
+    print("{0} - trying again...".format(ex))
     time.sleep(3)
   else:
     break
@@ -32,7 +32,7 @@ def query_mysql(query, headers = True, update = False):
     try:
       cnx = mysql.connector.connect(unix_socket = '/var/run/mysqld/mysqld.sock', user='__DBUSER__', passwd='__DBPASS__', database='__DBNAME__', charset="utf8")
     except Exception as ex:
-      print '%s - trying again...'  % (ex)
+      print("{0} - trying again...".format(ex))
       time.sleep(3)
     else:
       break
@@ -60,7 +60,7 @@ def notify_rcpt(rcpt, msg_count, quarantine_acl):
     try:
       template = Template(r.get('Q_HTML'))
     except:
-      print "Error: Cannot parse quarantine template, falling back to default template."
+      print("Error: Cannot parse quarantine template, falling back to default template.")
       with open('/templates/quarantine.tpl') as file_:
         template = Template(file_.read())
   else:
@@ -91,7 +91,7 @@ def notify_rcpt(rcpt, msg_count, quarantine_acl):
       break
     except Exception as ex:
       server.quit()
-      print '%s'  % (ex)
+      print('{0}'.format(ex))
       time.sleep(3)
 
 records = query_mysql('SELECT IFNULL(user_acl.quarantine, 0) AS quarantine_acl, count(id) AS counter, rcpt FROM quarantine LEFT OUTER JOIN user_acl ON user_acl.username = rcpt WHERE notified = 0 AND rcpt in (SELECT username FROM mailbox) GROUP BY rcpt')
@@ -102,25 +102,25 @@ for record in records:
   try:
     last_notification = int(r.hget('Q_LAST_NOTIFIED', record['rcpt']))
     if last_notification > time_now:
-      print 'Last notification is > time now, assuming never'
+      print('Last notification is > time now, assuming never')
       last_notification = 0
   except Exception as ex:
-    print 'Could not determine last notification for %s, assuming never' % (record['rcpt'])
+    print('Could not determine last notification for {0}, assuming never'.format(record['rcpt']))
     last_notification = 0
   attrs_json = query_mysql('SELECT attributes FROM mailbox WHERE username = "%s"' % (record['rcpt']))
   attrs = json.loads(str(attrs_json[0]['attributes']))
   if attrs['quarantine_notification'] not in ('hourly', 'daily', 'weekly', 'never'):
-    print 'Abnormal quarantine_notification value'
+    print('Abnormal quarantine_notification value')
     continue
   if attrs['quarantine_notification'] == 'hourly':
     if last_notification == 0 or (last_notification + 3600) < time_now:
-      print "Notifying %s about %d new items in quarantine" % (record['rcpt'], record['counter'])
+      print("Notifying {0} about {1} new items in quarantine".format(record['rcpt'], record['counter']))
       notify_rcpt(record['rcpt'], record['counter'], record['quarantine_acl'])
   elif attrs['quarantine_notification'] == 'daily':
     if last_notification == 0 or (last_notification + 86400) < time_now:
-      print "Notifying %s about %d new items in quarantine" % (record['rcpt'], record['counter'])
+      print("Notifying {0} about {1} new items in quarantine".format(record['rcpt'], record['counter']))
       notify_rcpt(record['rcpt'], record['counter'], record['quarantine_acl'])
   elif attrs['quarantine_notification'] == 'weekly':
     if last_notification == 0 or (last_notification + 604800) < time_now:
-      print "Notifying %s about %d new items in quarantine" % (record['rcpt'], record['counter'])
+      print("Notifying {0} about {1} new items in quarantine".format(record['rcpt'], record['counter']))
       notify_rcpt(record['rcpt'], record['counter'], record['quarantine_acl'])