Thanks for your answer. :)
In fact, I used the function on the "thankyou.php" page and the file "contactus.php" :
<?php echo (strip_tags(str_replace("\n","<BR />",$pval))); ?>
It seems to function correctly.
>> Do you want to strip them before they are inserted to the database,
1) Yes, it would be possible to use the function to avoid injection SQL ?
2) I would like to also record the email in a file CSV.
There is a possible solution ?
Thanks for your assistance.