diff --git a/data/Dockerfiles/dovecot/Dockerfile b/data/Dockerfiles/dovecot/Dockerfile
index 8bc60d9f..6c9afb29 100644
--- a/data/Dockerfiles/dovecot/Dockerfile
+++ b/data/Dockerfiles/dovecot/Dockerfile
@@ -71,10 +71,11 @@ RUN groupadd -g 5000 vmail \
   libwww-perl \
   mysql-client \
   procps \
-  python-html2text \
-  python-jinja2 \
-  python-mysql.connector \
-  python-redis \
+  python3 \
+  python3-html2text \
+  python3-jinja2 \
+  python3-mysql.connector \
+  python3-redis \
   redis-server \
   supervisor \
   syslog-ng \
diff --git a/data/Dockerfiles/dovecot/quarantine_notify.py b/data/Dockerfiles/dovecot/quarantine_notify.py
index b1af332a..87ef1e01 100755
--- a/data/Dockerfiles/dovecot/quarantine_notify.py
+++ b/data/Dockerfiles/dovecot/quarantine_notify.py
@@ -1,11 +1,10 @@
-#!/usr/bin/python
 
 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 +19,7 @@ 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('%s - trying again...'  % (ex))
     time.sleep(3)
   else:
     break
@@ -30,9 +29,9 @@ time_now = int(time.time())
 def query_mysql(query, headers = True, update = False):
   while True:
     try:
-      cnx = mysql.connector.connect(unix_socket = '/var/run/mysqld/mysqld.sock', user='__DBUSER__', passwd='__DBPASS__', database='__DBNAME__', charset="utf8")
+      cnx = mysql.connector.connect(unix_socket = '/var/run/mysqld/mysqld.sock', user='mailcow', passwd='sdvZ39iWd86UnVI772spU48VO1T8', database='mailcow', charset="utf8")
     except Exception as ex:
-      print '%s - trying again...'  % (ex)
+      print('%s - trying again...'  % (ex))
       time.sleep(3)
     else:
       break
@@ -40,10 +39,10 @@ def query_mysql(query, headers = True, update = False):
   cur.execute(query)
   if not update:
     result = []
-    columns = tuple( [d[0].decode('utf8') for d in cur.description] )
+    columns = tuple( [d[0] for d in cur.description] )
     for row in cur:
       if headers:
-        result.append(dict(zip(columns, row)))
+        result.append(dict(list(zip(columns, row))))
       else:
         result.append(row)
     cur.close()
@@ -60,7 +59,7 @@ 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 +90,7 @@ def notify_rcpt(rcpt, msg_count, quarantine_acl):
       break
     except Exception as ex:
       server.quit()
-      print '%s'  % (ex)
+      print('%s'  % (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 +101,25 @@ 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 %s, assuming never' % (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 %s about %d new items in quarantine" % (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 %s about %d new items in quarantine" % (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 %s about %d new items in quarantine" % (record['rcpt'], record['counter']))
       notify_rcpt(record['rcpt'], record['counter'], record['quarantine_acl'])
diff --git a/data/Dockerfiles/dovecot/quota_notify.py b/data/Dockerfiles/dovecot/quota_notify.py
index 669adec2..fdfda304 100755
--- a/data/Dockerfiles/dovecot/quota_notify.py
+++ b/data/Dockerfiles/dovecot/quota_notify.py
@@ -1,10 +1,10 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 import smtplib
 import os
-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 jinja2
 from jinja2 import Template
 import redis
@@ -17,7 +17,7 @@ if len(sys.argv) > 2:
   percent = int(sys.argv[1])
   username = str(sys.argv[2])
 else:
-  print "Args missing"
+  print("Args missing")
   sys.exit(1)
 
 while True:
@@ -25,7 +25,7 @@ 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('%s - trying again...'  % (ex))
     time.sleep(3)
   else:
     break
@@ -34,7 +34,7 @@ if r.get('QW_HTML'):
   try:
     template = Template(r.get('QW_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/quota.tpl') as file_:
       template = Template(file_.read())
 else:
@@ -55,10 +55,10 @@ try:
   msg.attach(html_part)
   msg['To'] = username
   p = Popen(['/usr/lib/dovecot/dovecot-lda', '-d', username, '-o', '"plugin/quota=maildir:User quota:noenforcing"'], stdout=PIPE, stdin=PIPE, stderr=STDOUT)
-  p.communicate(input=msg.as_string())
+  p.communicate(input=bytes(msg.as_string(), 'utf-8'))
 
 except Exception as ex:
-  print 'Failed to send quota notification: %s' % (ex)
+  print('Failed to send quota notification: %s' % (ex))
   sys.exit(1)
 
 try: