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This is the practice of verifying email addresses without sending (or attempting to send) emails to those addresses.

One way to ensure that your messages aren't marked as being from an "unknown sender" is to join Return Path's Certification program, a third-party accreditation and reputation service that provides with a list of responsible senders.

Microsoft does not allow this behavior and takes action on IPs that engage in it.

If any of your sending IPs is blocked for namespace mining, please check that your machines or email sending accounts are not compromised by an attacker who may be using your servers to harvest email addresses, and ensure that any method you use to validate email addresses does not use namespace mining techniques.

We may not accept email from senders who fail a reverse-DNS lookup.