Cant send mails using smtp

i want to enable SMTP on my droplet so that i can send mails.

i followed the tutorial : https://www.digitalocean.com/community/tutorials/how-to-use-gmail-or-yahoo-with-php-mail-function

the code is working fine when i use php <scriptname>.php

but when i use browser i get this error in my logs :

 cannot connect to smtp.gmail.com, port 465: Permission denied
msmtp: could not send mail (account gmail from /etc/msmtprc)
msmtp: cannot log to /var/log/msmtp.log: cannot open: Permission denied
msmtp: log info was: host=smtp.gmail.com tls=on auth=on user=**@**.com from=**@**.com recipients=**@**.com errormsg='cannot connect to smtp.gmail.com, port 465: Permission denied' exitcode=EX_TEMPFAIL