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This change is part of Microsoft's overall Trustworthy Computing Initiative and was made to further reduce the risk of malicious HTML content reaching our users.One way to ensure that your messages aren't marked as being from an "unknown sender" is to join Return Path's Certification program, a third-party accreditation and reputation service that provides with a list of responsible senders.
Senders must not use namespace mining techniques against inbound email servers.These services have been tailored for senders and for ISPs.To learn more about the Sender and ISP Services, go here.If the domain has a good sending reputation new IPs may experience a faster ramp up time.A new IP can expect to be fully ramped within a couple of weeks or sooner depending on volume, list accuracy and as long as their junk email complaint rates are kept at a minimum.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).
Avoid using scripting languages as they may be removed from your message.
Many email messages now contain HTML code similar to that found in a Web page. now analyzes and processes HTML content to remove HTML code that may be unsafe for your computer.
Microsoft does not allow this behavior and takes action on IPs that engage in it.