mail classified by spam from ionos vps to outlook.com

[test test]

Hi, i’m sending email from my vps (ionos one) and all the mail i send to hotmail/live/outlook mails are classified as spam. On gmail this is not happening.

[Marc-Antoine St-Pierre]

Same problem is happening for me, but i’m not with ionos one, using another vps provider (ovh).

logs:

550 5.7.1 Unfortunately, messages from [xxx.xxx.xxx.xxx] 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.

[Ben Mitchell]

Check out https://www.mail-tester.com

‌

It will give you some feedback on how to improve your mail server’s score.