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).
Once the IP has built a reputation for not sending spam, will typically allow for a better email delivery experience.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 does not allow this behavior and takes action on IPs that engage in it.Currently, the addresses for these servers are mx1.hotmail.com, mx2.hotmail.com, mx3.and mx4.If that doesn't work, try connecting directly to the IPs.They are not available in the UK yet but should add an extra fun element to an already good dating site when they arrive.
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Note: Deliverability issues submitted using this form should only be related to the system, including any address @msn.com, @Outlook.com, @hotmail.com, or @
Senders must not use namespace mining techniques against inbound email servers.
This is the practice of verifying email addresses without sending (or attempting to send) emails to those addresses.
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.