The built-in validation tests that your mail flow from Office 365 reaches: For more information, see Validate connectors in Office 365 Mail flow issues can also happen when your MX record is not setup correctly.
To verify your MX record, see Find and fix issues after adding your domain or DNS records in Office 365.
Test set: A set of examples used only to assess the performance [generalization] of a fully specified classifier.
Validation set: A set of examples used to tune the parameters [i.e., architecture, not weights] of a classifier, for example to choose the number of hidden units in a neural network.The use of tests and other selection procedures can be a very effective means of determining which applicants or employees are most qualified for a particular job.However, use of these tools can violate the federal anti-discrimination laws if an employer intentionally uses them to discriminate based on race, color, sex, national origin, religion, disability, or age (40 or older).Witnesses addressed legal issues related to the use of employment tests and other selection procedures.(To see the testimony of these witnesses, please see the EEOC’s website at This fact sheet provides technical assistance on some common issues relating to the federal anti-discrimination laws and the use of tests and other selection procedures in the employment process.