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/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