diff --git a/libksieve/ksieveui/util/util.cpp b/libksieve/ksieveui/util/util.cpp
--- a/libksieve/ksieveui/util/util.cpp
+++ b/libksieve/ksieveui/util/util.cpp
@@ -114,9 +114,20 @@
     } else {
         KUrl u( interface->sieveAlternateUrl() );
         const QString resultSafety = interface->safety();
+
+        if (u.protocol().isEmpty()) {
+          u.clear();
+          u.setScheme(QLatin1String("sieve"));
+          u.setHost(interface->sieveAlternateUrl());
+        }
+
         if ( u.protocol().toLower() == QLatin1String("sieve") && ( resultSafety ==  QLatin1String("None") ) && u.queryItem(QLatin1String("x-allow-unencrypted")).isEmpty() )
             u.addQueryItem( QLatin1String("x-allow-unencrypted"), QLatin1String("true") );
 
+        if (u.port() == -1) {
+          u.setPort(4190);
+        }
+
         const QString resultCustomAuthentication = interface->sieveCustomAuthentification();
         if (resultCustomAuthentication == QLatin1String("ImapUserPassword")) {
             u.setUserName( interface->userName() );
@@ -127,6 +138,32 @@
                 pwd = replyPass;
             }
             u.setPassword( pwd );
+            QString authStr;
+            switch( interface->authentication() ) {
+              case MailTransport::Transport::EnumAuthenticationType::CLEAR:
+              case MailTransport::Transport::EnumAuthenticationType::PLAIN:
+                authStr = QLatin1String("PLAIN");
+                break;
+              case MailTransport::Transport::EnumAuthenticationType::LOGIN:
+                authStr = QLatin1String("LOGIN");
+                break;
+              case MailTransport::Transport::EnumAuthenticationType::CRAM_MD5:
+                authStr = QLatin1String("CRAM-MD5");
+                break;
+              case MailTransport::Transport::EnumAuthenticationType::DIGEST_MD5:
+                authStr = QLatin1String("DIGEST-MD5");
+                break;
+              case MailTransport::Transport::EnumAuthenticationType::GSSAPI:
+                authStr = QLatin1String("GSSAPI");
+                break;
+              case MailTransport::Transport::EnumAuthenticationType::ANONYMOUS:
+                authStr = QLatin1String("ANONYMOUS");
+                break;
+              default:
+                authStr = QLatin1String("PLAIN");
+                break;
+            }
+            u.addQueryItem( QLatin1String("x-mech"), authStr );
         } else if (resultCustomAuthentication == QLatin1String("CustomUserPassword")) {
             QDBusInterface resourceSettings( QLatin1String( "org.freedesktop.Akonadi.Resource." ) + identifier, QLatin1String("/Settings"), QLatin1String("org.kde.Akonadi.Imap.Wallet") );
             QString pwd;