In order to begin troubleshooting an issue it is necessary to ensure that you are upgraded to the latest version.
12all is developed to work with a wide range of server settings and configurations. We can not begin troubleshooting and working out a fix with a version that is not up to date.
If there is an issue with sending we need to understand why this is happening. A sending issue may only effect a few servers but updates allow us to account for these settings. Development will be responsive to any issues that occur with your manager but we must first ensure that you are using the latest version so that we know that you are not experiencing any issues which have already been accounted for.