My customer can not send Email becase ip blacklist Hotmail.Could you please tell us that link for delist ip of hotmail.

Hello

tip: send message to delist@messaging.microsoft.com with smtp server ip

Hi,

Can you send message to another domain? Or this issue only occur on send message to Hotmail?
Do you create SPF record? If no, please create it and try again.

Additional, I would suggest you to contact Microsoft Sender Support Team.
Here is the link below:
https://support.live.com/eform.aspx?productKey=edfsmsbl3&ct=eformts&wa

Thanks