Always process send operations on connectivity changes

app/src/main/java/eu/faircode/email/ServiceSend.java

@@ -229,10 +229,10 @@ public class ServiceSend extends ServiceBase {
     };
 
     private void checkConnectivity() {
-        boolean suitable = ConnectionHelper.getNetworkState(ServiceSend.this).isSuitable();
+        boolean suitable = ConnectionHelper.getNetworkState(this).isSuitable();
         if (lastSuitable != suitable) {
             lastSuitable = suitable;
-            EntityLog.log(ServiceSend.this, "Service send suitable=" + suitable);
+            EntityLog.log(this, "Service send suitable=" + suitable);
 
             try {
                 NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
@@ -240,6 +240,7 @@ public class ServiceSend extends ServiceBase {
             } catch (Throwable ex) {
                 Log.w(ex);
             }
+        }
 
         if (suitable)
             executor.submit(new Runnable() {
@@ -249,7 +250,6 @@ public class ServiceSend extends ServiceBase {
                 }
             });
     }
-    }
 
     private void processOperations() {
         try {
@@ -376,6 +376,10 @@ public class ServiceSend extends ServiceBase {
         if (!message.content)
             throw new IllegalArgumentException("Message body missing");
 
+        ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
+        if (cm.isActiveNetworkMetered())
+            throw new IOException("Metered");
+
         // Create message
         Properties props = MessageHelper.getSessionProperties();
         Session isession = Session.getInstance(props, null);