Problem with Opencart emails

I have a problem to send emails from my website, everything is working but after few days it does not work anymore. Each time I have to reboot the server to make it work again, I cannot do that all the time, I need a clear solution. I thought it may be linked to updates of cpanel for EA or something else but I am not sure. I do use openssl, apache and php 5.6. It seems the problem is linked to the certificate and openssl. I use the Opencart Framework 2.0.1.1. I tried to add this trick when creating the socket client: $streamContext = stream_context_create([ 'ssl' => [ 'verify_peer' => false, 'verify_peer_name' => false ] ]); See forum.codeigniter.com/archive/index.php?thread-590.html for the thing I did follow. However, this does not seem to solve the problem since the password does not get accepted for the smtp account. I do use tls://smtp-relay.gmail.com with port 587. I would appreciate if I get a solution to this problem as soon as possible because I am losing money right now, my customers cannot log or even contact us.