Voting and insert Custom post Type

[Oliviercreativ]

Hello,
I would like to use the voting system to vote with the cookie but I want to leave a trace with a wp_insert_post in a CTP "vote", by cons how can you put the email in the title?

My url: https://example.com/?mail=test@test.fr
The insertion is going well, I recuperate the value of the vote in the_content () but I just have the mail title.
I'm trying with a $ _GET ['mail'] in the post_title, a $ _POST ['mail'] by adding a field in the form but nothing ...