The IP address of the server you are sending emails from has been identified as a source of spam.
This happened because Poczta Interia users have been massively marking emails from this IP address as SPAM.
To protect our users, your email has been blocked.
If you are not sending spam and your message has been rejected it can be due to one of the reasons below:
The data controller is Interia.pl sp. z o.o. with its registered office in Krakow, ul. Kotlarska 11, 31-539 Kraków. Your personal data will be processed in order to handle the submitted request. You have the right to: access your data, rectify (correct) it, delete it, restrict processing, object to data processing, and lodge a complaint with the supervisory authority - the President of the Office for Personal Data Protection. More information about how we process data can be found here.