php mail cannot be sent with smtp.gmail.com [duplicate]

Answer 1

sometimes an isp provides free smtp service for their clients to some degree. google yourisp & smtp.

Answer 2

Gmail servers use TLS and login/password authentification, you can't use them with PHP's mail() function.

Try using a mail library like Swiftmailer. Here is an example that may work with Gmail: http://swiftmailer.org/wikidocs/v3/connections/smtp

Answer 3

You need to use SMTP authorization for gmail's SMTP server to work which you can't do with mail.

Take a look at PHPMailer they have a good example here.