TL;DR: you haven't got any
Logs are retained until the end of time, or until I screw up and lose them.
When you send a message through the hate mail form, your message
is sent via the cock.li
mail service.
Your IP address and user agent are included with the message.
All messages are logged, even if they are not sent (e.g. failed
captcha).
All the hit counters (these: ) do is increment a number
in a file corresponding to the page you visit.
None of this information is shared with third-parties, except if
I decide to show a friend something funny/interesting in the logs.
As far as I know nothing sets third-party cookies/trackers etc.