We may not accept email from senders who fail a reverse-DNS lookup.In some cases legitimate senders advertise themselves incorrectly as a non-internet routable IP when attempting to open a connection to
IP addresses that are reserved for private (non-routable) networking are 192.168.0.0/16, 10.0.0.0/8, and 172.16.0.0/11 (or 192.168.0.0 - 192.168.255.255, 10.0.0.0 - 10.255.255.255, 172.16.0.0 - 1.255).
We have developed some tools and services which will give you more information about how our users are rating your email.
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 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.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).Currently, the addresses for these servers are mx1.hotmail.com, mx2.hotmail.com, mx3.and mx4.IPs not previously used to send email typically don't have any reputation built up in our systems.As a result, emails from new IPs are more likely to experience deliverability issues.These services have been tailored for senders and for ISPs.