diff --git a/app/src/main/java/eu/faircode/email/ServiceUI.java b/app/src/main/java/eu/faircode/email/ServiceUI.java
index ba301f44ec..c0ecf6f0f0 100644
--- a/app/src/main/java/eu/faircode/email/ServiceUI.java
+++ b/app/src/main/java/eu/faircode/email/ServiceUI.java
@@ -291,7 +291,7 @@ public class ServiceUI extends IntentService {
 
             // Get properties
             Properties props = MessageHelper.getSessionProperties(account.auth_type, account.realm, account.insecure);
-            props.put("mail." + protocol + ".separatestoreconnection", true);
+            props.put("mail." + protocol + ".separatestoreconnection", "true");
 
             // Create session
             final Session isession = Session.getInstance(props, null);
@@ -361,7 +361,7 @@ public class ServiceUI extends IntentService {
 
             // Get properties
             Properties props = MessageHelper.getSessionProperties(account.auth_type, account.realm, account.insecure);
-            props.put("mail." + protocol + ".separatestoreconnection", true);
+            props.put("mail." + protocol + ".separatestoreconnection", "true");
 
             // Create session
             final Session isession = Session.getInstance(props, null);
diff --git a/app/src/main/java/eu/faircode/email/ViewModelBrowse.java b/app/src/main/java/eu/faircode/email/ViewModelBrowse.java
index cc624f902c..c67077d83f 100644
--- a/app/src/main/java/eu/faircode/email/ViewModelBrowse.java
+++ b/app/src/main/java/eu/faircode/email/ViewModelBrowse.java
@@ -167,7 +167,7 @@ public class ViewModelBrowse extends ViewModel {
 
                 // Get properties
                 Properties props = MessageHelper.getSessionProperties(account.auth_type, account.realm, account.insecure);
-                props.put("mail." + protocol + ".separatestoreconnection", true);
+                props.put("mail." + protocol + ".separatestoreconnection", "true");
 
                 // Create session
                 Session isession = Session.getInstance(props, null);