Problets transmit session data back to the server by email. Lately, some schools have been disabling email generated by third parties (such as problets) to counter spam. In such cases, the student will still be able to complete the problet session, although with noticeable delay during the times the problet unsuccessfully tries to transmit data to the server. Data from these students will not be included in the report provided to the instructor. Confirmation code printed on the last screen can be used as an alternative mechanism to confirm student's use of the problet.