Some information related to Microsoft blacklisting:

A form to declare valid IP from your domain:

Look at your logs

Look at the message in your mail log. You should see the email address of a contact. You can also directly send an email to

Check with a tool

A good tool to check if you are blacklisted:

Check you DNS zone file

Once blacklisted, make sure you are correctly setup on your side and check your DNS zone file: – SPF record – PTR

Send an email to or yahoo and check the email header, it contains details regarding SPAM detection and SPF check.