diff --git a/src/kmailtransport/mailtransport.kcfg b/src/kmailtransport/mailtransport.kcfg
--- a/src/kmailtransport/mailtransport.kcfg
+++ b/src/kmailtransport/mailtransport.kcfg
@@ -98,6 +98,11 @@
       <label><!-- TODO --></label>
       <whatsthis>Enter the address that should be used to overwrite the default sender address.</whatsthis>
     </entry>
+    <entry name="useProxy" type="Bool">
+      <label>Connect using the system proxy settings</label>
+      <whatsthis>If checked, the system proxy settings will be used to connect to the mail server.</whatsthis>
+      <default>false</default>
+    </entry>
   </group>
 
 </kcfg>
diff --git a/src/kmailtransport/plugins/smtp/smtpjob.cpp b/src/kmailtransport/plugins/smtp/smtpjob.cpp
--- a/src/kmailtransport/plugins/smtp/smtpjob.cpp
+++ b/src/kmailtransport/plugins/smtp/smtpjob.cpp
@@ -145,6 +145,7 @@
     d->session = s_sessionPool->sessions.value(transport()->id());
     if (!d->session) {
         d->session = new KSmtp::Session(transport()->host(), transport()->port());
+        d->session->setUseNetworkProxy(transport()->useProxy());
         d->session->setUiProxy(d->uiProxy);
         if (transport()->specifyHostname()) {
             d->session->setCustomHostname(transport()->localHostname());
diff --git a/src/kmailtransport/plugins/smtp/smtpsettings.ui b/src/kmailtransport/plugins/smtp/smtpsettings.ui
--- a/src/kmailtransport/plugins/smtp/smtpsettings.ui
+++ b/src/kmailtransport/plugins/smtp/smtpsettings.ui
@@ -282,6 +282,13 @@
             <item row="2" column="1">
              <widget class="QComboBox" name="authCombo"/>
             </item>
+            <item row="3" column="0" colspan="2">
+             <widget class="QCheckBox" name="kcfg_useProxy">
+              <property name="text">
+               <string>Connect using the system proxy settings</string>
+              </property>
+             </widget>
+            </item>
            </layout>
           </item>
          </layout>