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The List of Tests

There are currently three tests available, with more planned in the future. One test for senders, and two for receivers. The tests are triggered by a command in the subject of the email to

The test system allows for 12 test messages a day, with five minutes between tests. This is to prevent the system being used for abuse. Frequent abuse of the system will result in that sender blacklisted and messages sent to will be discarded.

Questions or comments should be sent to the HAD Test Tool admin

NIST is an agency of the U.S. Department of Commerce.

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Date created 10/19/2016. Last updated 03/20/2017.