PHPMail error : Extension missing: openssl

Hi,
I have this error in journal log
Is there a known solution to this issue?

2017-05-12 09:28:30.689 ***** ERROR ***** [V6.2.4] Error sending mail
2017-05-12 09:28:30.690 ***** ERROR ***** [V6.2.4] SMTP Server : smtp.NotAllowedScript681bddef078b8live.com
2017-05-12 09:28:30.691 ***** ERROR ***** [V6.2.4] SMTP Port : 25
2017-05-12 09:28:30.692 ***** ERROR ***** [V6.2.4] Mail stored in Database : #9
2017-05-12 09:28:30.693 ***** ERROR ***** [V6.2.4] PHPMail error : Extension missing: openssl
2017-05-12 09:28:30.694 ***** ERROR ***** [V6.2.4] PHPMail debug :

My parameters are :
smtp server : smtp.gmail.com
smtp port : 25
smtp login name : Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.
smtp login password : •••••••••••
end of line format for mail : default format (\r\n)
sendmail path :
Mailer Type : Library PHPMailer (recommended)

openSSL is an extension of PHP .

If you use wamp , go in PHP --> extensions PHP ---> and check if php_openssl if activated. ( see screenshot )