Merhaba, outlook, live, ve hotmail uzantılı maillere kendi domainimden gönderdiğim mailler spama bile düşmüyor, geri dönüyor.
Sorunun ne olduğunu çözemedim. Yardımcı olabilir misiniz.

Geri dönüş hata raporu:
Reporting-MTA: dns; xx.xx.com
X-Postfix-Queue-ID: 5F7C06031A71
X-Postfix-Sender: rfc822; posta@domain.com.tr
Arrival-Date: Sat, 5 Jan 2019 20:16:25 +0300 (+03)

Final-Recipient: rfc822; xx@outlook.com
Original-Recipient: rfc822;xx@outlook.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; outlook-com.olc.protection.outlook.com
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [xx.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 http://mail.live.com/mail/troubleshooting.aspx#errors.
[VE1EUR02FT046.eop-EUR02.prod.protection.outlook.com]