diff --git a/tests/compose/core/05_connectivity.py b/tests/compose/core/05_connectivity.py
index 480dca46..cee02cf6 100755
--- a/tests/compose/core/05_connectivity.py
+++ b/tests/compose/core/05_connectivity.py
@@ -3,7 +3,8 @@
 import imaplib
 import poplib
 import smtplib
-import os
+import sys
+import managesieve
 
 SERVER='localhost'
 USERNAME='user@mailu.io'
@@ -26,7 +27,7 @@ def test_imap(server, username, password):
         with imaplib.IMAP4(server) as conn:
             conn.login(username, password)
         print(f'Authenticating to imap://{username}:{password}@{server}:143/ worked without STARTTLS!')
-        os.exit(102)
+        sys.exit(102)
     except imaplib.IMAP4.error:
         print('NOK - expected')
 
@@ -54,7 +55,7 @@ def test_pop3(server, username, password):
         conn.pass_(password)
         conn.close()
         print(f'Authenticating to pop3://{username}:{password}@{server}:110/ worked without STARTTLS!')
-        os.exit(103)
+        sys.exit(103)
     except poplib.error_proto:
         print('NOK - expected')
 
@@ -77,7 +78,7 @@ def test_SMTP(server, username, password):
             conn.ehlo()
             conn.login(username, password)
             print(f'Authenticating to smtp://{username}:{password}@{server}:587/ worked!')
-            os.exit(104)
+            sys.exit(104)
     except smtplib.SMTPNotSupportedError:
         print('NOK - expected')
     #port 25 should fail
@@ -89,7 +90,7 @@ def test_SMTP(server, username, password):
             conn.ehlo()
             conn.login(username, password)
             print(f'Authenticating to smtps://{username}:{password}@{server}:25/ worked!')
-            os.exit(105)
+            sys.exit(105)
     except smtplib.SMTPNotSupportedError:
         print('NOK - expected')
     try:
@@ -98,11 +99,36 @@ def test_SMTP(server, username, password):
             conn.ehlo()
             conn.login(username, password)
             print(f'Authenticating to smtp://{username}:{password}@{server}:25/ worked without STARTTLS!')
-            os.exit(106)
+            sys.exit(106)
     except smtplib.SMTPNotSupportedError:
         print('NOK - expected')
 
+def test_managesieve(server, username, password):
+    print(f'Authenticating to sieve://{username}:{password}@{server}:4190/')
+    m=managesieve.MANAGESIEVE(server)
+    try:
+        m.login('PLAIN', username, password)
+        print(f'Worked without STARTTLS!')
+        sys.exit(107)
+    except managesieve.MANAGESIEVE.abort:
+        pass
+
+    m=managesieve.MANAGESIEVE(server, use_tls=True)
+    if m.login('', username, 'wrongpass') != 'NO':
+        print(f'Authenticating to sieve://{username}:{password}@{server}:4190/ with wrong creds has worked!')
+        sys.exit(108)
+
+    if m.login('', username, password) != 'OK':
+        print(f'Authenticating to sieve://{username}:{password}@{server}:4190/ has failed!')
+        sys.exit(109)
+    
+    if m.listscripts()[0] != 'OK':
+        print(f'Listing scripts failed!')
+        sys.exit(110)
+    print('OK')
+
 if __name__ == '__main__':
     test_imap(SERVER, USERNAME, PASSWORD)
     test_pop3(SERVER, USERNAME, PASSWORD)
     test_SMTP(SERVER, USERNAME, PASSWORD)
+    test_managesieve(SERVER, USERNAME, PASSWORD)
diff --git a/tests/compose/core/docker-compose.yml b/tests/compose/core/docker-compose.yml
index 8d56a443..384e89cd 100644
--- a/tests/compose/core/docker-compose.yml
+++ b/tests/compose/core/docker-compose.yml
@@ -30,6 +30,7 @@ services:
       - "127.0.0.1:995:995"
       - "127.0.0.1:143:143"
       - "127.0.0.1:993:993"
+      - "127.0.0.1:4190:4190"
     volumes:
       - "/mailu/certs:/certs"
 
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 771b9926..67060918 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,2 +1,3 @@
 docker==4.2.2
 colorama==0.4.3
+managesieve==0.7.1