Dump SMTP on I/O errors

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

@@ -732,6 +732,9 @@ public class ServiceSend extends ServiceBase implements SharedPreferences.OnShar
 
             db.identity().setIdentityError(ident.id, Log.formatThrowable(ex));
 
+            throw ex;
+        } catch (Throwable ex) {
+            iservice.dump();
             throw ex;
         } finally {
             iservice.close();