最近公司寄往hotmail(msn.com或outlook.com)的信都被退回, 錯誤訊息是550.5.7.1 , 我有去spam 查詢沒有列在黑名單, 也有上hotmail請求刪除列在黑名單回應是沒有列入. 也有提交hotmail的提問表單, 可是一直無法順利提交. 一直轉圈圈, 真不知從何下手, 求救各位大大.... 錯誤訊息在下面.

outlook-com.olc.protection.outlook.com[104.47.51.33] said: 550 5.7.1 Unfortunately, messages from [公司寄信ip] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors.
[BN1NAM02FT020.eop-nam02.prod.protection.outlook.com
2023-09-06T06:43:25.494Z 08DBAE8CCEF50988] (in reply to MAIL FROM command)

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 [公司寄信ip]weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
[BN1NAM02FT020.eop-nam02.prod.protection.outlook.com
2023-09-06T06:43:25.494Z 08DBAE8CCEF50988]