I don't understand why when I try to send a mail using PHP mail function, I don't receive any mail when there is a url with variables in the body of the message such as http://www.chicmaker.com/fr/xxx.html?id_client=2 ? Any idea or clue ?
It looks like you're hitting a spam filter that checks whether there's reason to believe that the links are owned by the sender. You should make sure that the domain part of all your links corresponds with the sender email domain. For example:
http://www.chicmaker.com/fr/xxx.html
should correspond with:
noreply@chicmaker.com