We used to snapshot the that rendered the blacklist reason.
However, as of 25th may 2018, when the data protection law changed the history of personal integrity, we no longer store this kind of content. It might sound strange that we do not store spam that works like a proof for why e-mail has been blacklisted. It also normally helps system administrators (especially those who administers email services) to trace the source of spam. But to protect the receivers part data, the mail spam storage project has been abandoned.