Language String Failed to load : Recipients_failed - php

Question

I have a script that sends a mail to validate a form made by a user. It's a professional application so the mail isn't a spam and the users are members of the company.
Now my PHPmailer() function bug once in two randomly. I would like technical help to see if I did something wrong in my PHP code. So first of all, this is what it should do:
1) the user end his form
2) he has to choose who will receive the email (between 3 choices, and he can cross the 3 checkboxes)
3) One mail will be sent to each person he checked, with a simple link to see the result of the form.
But most of the time, I have this error message:
Language String failed to load:
Recipients_failed [mail]
*[Mail] = the email address*
The PHP script stops there, the page doesn't finish loading and the mail isn't send.
for the exemple, we'll say that in the first page we have [mail1], [mail2] and [mail3] who are 3 checkboxes.
Here is my code:
if(isset['[mail1]']){
$mail = new PHPmailer();
$mail->IsSMTP();
$mail->IsHTML(true);
$mail->Host=*;
$mail->Port=*;
$mail->From='no-reply#*.fr';
$mail->FromName=*;
$mail->SMTPSecure = 'tls';
$mail->SMTPAuth=true;
$mail->Username='no-reply#*.fr';
$mail->Password='*';
$mail->AddAddress([mail1]);
$mail->Subject="*";
$mail->Body = utf8_decode("*");
if(!$mail->Send()){
die($mail->ErrorInfo);
}
$mail->SmtpClose();
unset($mail);
}
I think that the code is ok because this works sometimes, but doesn't work sometimes... What should I do? Speak to OVH or there is something I did wrong?

Answer 1

I think your question has nothing to do with PHP.
The error message simply tells you that one of the recipients does not exist - this message does not come from php but from the SMTP server you are using.
However: I don't know why the server shows you an error message "no translation" - you should contact "OVH" and ask.