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If that doesn't work, try connecting directly to the IPs.
Senders must not use namespace mining techniques against inbound email servers.
Occasionally, some of the IPs in our MX record may be out of service.
If you are connecting to one of these IPs your connection may timeout. You may also configure your outbound email server to do a round-robin DNS lookup for
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.
This is the practice of verifying email addresses without sending (or attempting to send) emails to those addresses.