when I send emails from work to my priv address, some of them are rejected by Outlook severs. Even domain was added to whitelist. Everytime I get:
This is the mail system at host sargas.put.poznan.pl.
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system
<firstname.lastname@example.org>: host hotmail-com.olc.protection.outlook.com[126.96.36.199] said: 550 5.7.1 Unfortunately, messages from [188.8.131.52] 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. [BN7NAM10FT028.eop-nam10.prod.protection.outlook.com] (in reply to MAIL FROM command)