Hi @TrevReav , to complete your intervention, each value has a name and often the values are 1,2,3,4 depending on the number of choices in the list. When we send an email with the site we receive on the host only the value or position and not the name. In the same way we receive :
You have received a new message.
Name_32201: Laura Moron-rey
Email_32201: test@tes.fr
Select_1240: 2
Message_32201: tets
Optin_32201: true
I think that the subject must have been treated
Ah, Ok, just my thoughts, sorry not to be able to help.
No problem. Itâs already nice to be able to help me, I appreciate your initiative 
I could be wrong but I think the rule you had there is intended to disallow access to files with the extension as specified in the rule, usually used for example if you have a directory with files you are experimenting with and donât wan to be accessed
However having such rule in the main htaccess would likely render the entire site inaccessible
So it shouldnât be a security problem removing that rule.
But Iâm not an expert on this, just from what I know usual htaccess rules in the root wonât include such restrictions.
So you should be fine âŚ
Thank you for your feedback to my question and it reassures me a lot what you say. Indeed it was to secure a little more but the site works and I even personalized the reception of the mail by removing what bothered me above with values like name_33201, email_33201 etc 
In case, there would be people who would seek to customize the mail reception and remove the names of each block followed by the ID of the form, it is necessary to go to the folder âincludeâ edit the file "form_(ID of your form) " Go to the bottom of the page in the part create a mail and you change only the names before the â:â.
For example if you have Name_3301:$name_3301, you can modify by Client Name: $name_3301, etc
Attention for those who have selector: If you want to know what choice the customer has made, you must go in blocks edit the selector and for each option give the value of your selection and not numbers because otherwise you will receive the mail from a future customer with âselection :2â.
Good idea to highlight this. Iâve always done that, but if youâre not use to forms it might not be so obvious.
@PeteSharp. For my part itâs fine, itâs just that you have to understand how BLOCS works and its interactions. Iâve set myself a goal of making a site with BLOCS for a friend. Now I will be able to give myself other goals and create other sites with different needs and I will be super comfortable. 