diff --git a/core/admin/mailu/internal/views/autoconfig.py b/core/admin/mailu/internal/views/autoconfig.py
index 46d6531f..32a475cd 100644
--- a/core/admin/mailu/internal/views/autoconfig.py
+++ b/core/admin/mailu/internal/views/autoconfig.py
@@ -31,7 +31,7 @@ def autoconfig_mozilla():
 <username>%EMAILADDRESS%</username>
 <authentication>password-cleartext</authentication>
 <addThisServer>true</addThisServer>
-<useGlobalPreferredServer>true</useGlobalPreferredServer>
+<useGlobalPreferredServer>false</useGlobalPreferredServer>
 </outgoingServer>
 
 <documentation url="https://{hostname}/admin/client">
diff --git a/tests/compose/core/05_connectivity.py b/tests/compose/core/05_connectivity.py
index 44bb4553..0a180cda 100755
--- a/tests/compose/core/05_connectivity.py
+++ b/tests/compose/core/05_connectivity.py
@@ -119,7 +119,7 @@ def test_managesieve(server, username, password):
     except managesieve.MANAGESIEVE.abort:
         pass
 
-    m=managesieve.MANAGESIEVE(server, use_tls=True)
+    m=managesieve.MANAGESIEVE(server, use_tls=True, tls_verify=False)
     if m.login('', username, 'wrongpass') != 'NO':
         print(f'Authenticating to sieve://{username}:{password}@{server}:4190/ with wrong creds has worked!')
         sys.exit(108)
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 8d06bd70..abdb8674 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,4 +1,4 @@
 docker==7.0.0
 colorama==0.4.6
-managesieve==0.7.1
+managesieve==0.8
 requests==2.31.0
diff --git a/towncrier/newsfragments/3721.bugfix b/towncrier/newsfragments/3721.bugfix
new file mode 100644
index 00000000..211ea2fe
--- /dev/null
+++ b/towncrier/newsfragments/3721.bugfix
@@ -0,0 +1 @@
+autoconfig shouldn't set useGlobalPreferredServer