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.
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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
This section provides troubleshooting information for senders who are having trouble reaching users by email.
If you are an user looking for support with your account, please visit our end user support page.
However, submitting this information does not guarantee that any message you send to users of the services will be delivered.
Senders must not use namespace mining techniques against inbound email servers.
Alternatively, if an user adds your domain or email address to their "contacts" or their "safe-senders list" they will no longer see this notification.
In addition, senders who are on the Return Path Certification list or on a user's "safe sender's" list typically experience links and images within their messages enabled by default. An "allow list" is essentially a "free pass" which allows emails from certain senders to bypass junk email filters and other precautions. You can find out more about our filtering processes here. who helps ensure the legitimacy of certain senders via their Return Path Certification program.
This is the practice of verifying email addresses without sending (or attempting to send) emails to those addresses.
This method is commonly used by malicious senders to generate lists of valid e-mail addresses that they can send spam, phishing emails or malware.
Some of the deliverability issues are the result of sender-based software configurations.