How to fix error Swift_TransportException in Laravel 5.6

working with laravel 5.6 and I am going to send contact form details via the gmail. My .env file is look like this,

MAIL_DRIVER=smtp
MAIL_HOST=smtp.gmail.com
MAIL_PORT=587
MAIL_USERNAME=myname@gmail.com
MAIL_PASSWORD=password
MAIL_ENCRYPTION=null

but when I send submit buttons following error is coming,

1/1) Swift_TransportException

Expected response code 250 but got code "530", with message "530 5.7.0 Must issue a STARTTLS command first. u21-v6sm32263983pfa.176 - gsmtp
"
in AbstractSmtpTransport.php line 383

how can fix this project?

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