Once the IP has built a reputation for not sending spam, will typically allow for a better email delivery experience.
New IPs that are added for domains that are authenticated under existing SPF records typically experience the added benefit of inheriting some of the domain's sending reputation.
This section provides troubleshooting information for senders who are having trouble reaching users by email.
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As a result, emails from new IPs are more likely to experience deliverability issues.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 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.
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.