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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.

Microsoft's Smart Screen® technology is designed to provide anti-spam filtering innovations for as well as other Microsoft products like Exchange Server, Microsoft Office Outlook and Windows Live Mail.

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These services have been tailored for senders and for ISPs.

To learn more about the Sender and ISP Services, go here.

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.

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 If that doesn't work, try connecting directly to the IPs.If you are able to connect directly to the IP and not mail.hotmail.com, then it is likely there is an issue with your DNS server.Some of the deliverability issues are the result of sender-based software configurations.If you are running anti-virus software on your firewall or SMTP server, check for the setting "Internet Email Auto Protect" or "Internet Email Protection." If this setting is enabled, disable it and try sending a test message to our servers again. If you are unable to connect, then attempt to telnet over port 25 directly to our email servers (MTAs).You can find the current list of our MTAs by querying "nslookup –q=mx hotmail.com" from a command prompt (this should work in a variety of Operating Systems).

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