outlook problem

Hello
it puts impossible to send on hotmail outlook
I always receive an error
I tested several mail configuration impossible to send on the other hand I do receive hotmail mail.
gmail and other messaging no problem
thank you

 hotmail-com.olc.protection.outlook.com[104.47.59.161] said: 550 5.7.1
    Unfortunately, messages from [xxx.xx.xx.xx] weren't sent. Please contact
    your Internet service provider since part of their network is on our block
    list (S3140). You can also refer your provider to

mail tester 10/10

they have blacklisted your ip, you should probably check more detailed other blacklists also
https://mxtoolbox.com/blacklists.aspx

thank you for your comeback
I had already tested
also send an email to "hotmail" but without responding from their parts

probably if you got blocked they will leave you blocked for some time, Gmail for example blocks your domain for one month.

thank you
but the problem is that I have just configured the mailbox so I have never sent 1 single mail for more than 1 year on hotmail or others but only hotmail is blocking 
I'm waiting for their answers 

you should check the mail server logs as you could have some malware, however, this is probably a lower possibility as you would be blacklisted then on other sites.

We have completed reviewing the IP(s) you submitted. The following table contains the results of our investigation.


Not qualified for mitigation
163.xxx.xxx.xx/32
Our investigation has determined that the above IP(s) do not qualify for mitigation.

Please ensure your emails comply with the Outlook.com policies, practices and guidelines found here: http://mail.live.com/mail/policies.aspx.

To have Deliverability Support investigate further, please reply to this email with a detailed description of the problem you are having, including specific error messages, and an agent will contact you.


Regardless of the deliverability status, Outlook.com recommends that all senders join two free programs that provide visibility into the Outlook.com traffic on your sending IP(s), the sending IP reputation with Outlook.com and the Outlook.com user complaint rates.


Junk Email Reporting program (JMRP) When an Outlook.com user marks an email as "junk", senders enrolled in this program get a copy of the mail forwarded to the email address of their choice. It allows senders to see which mails are being marked as junk and to identify mail traffic you did not intend to send. To join, please visit


https://sendersupport.olc.protection.outlook.com/snds/JMRP.aspx


Smart Network Data Services program (SNDS). This program allows you to monitor the ‘health’ and reputation of your registered IPs by providing data about traffic such as mail volume and complaint rates seen originating from your IPs. To register, please visit http://postmaster.live.com/snds/.


There is no silver bullet to maintaining or improving good IP reputation, but these programs help you proactively manage your email eco-system to help better ensure deliverability to Outlook.com users.


Thank you,


Outlook.com Deliverability Support

Hello,

My name is Deepthi and I work with the Outlook.com Deliverability Support Team.

We have implemented mitigation for your IP (163.xxx.xx.xx) and this process may take 24 - 48 hours to replicate completely throughout our system.

Sincerely,

Deepthi
Outlook.com Deliverability Support.

now everything works perfectly
but why is hotmail blocking ip for no reason? ...