for this just add your emails server settings in the .env
MAIL_DRIVER=smtp
MAIL_HOST=smtp.myserver.com
MAIL_PORT=465
MAIL_USERNAME=ENTER_YOUR_EMAIL_ADDRESS
MAIL_PASSWORD=ENTER_YOUR_EMAIL_PASSWORD
MAIL_ENCRYPTION=ssl
first create an email on your hosting server
then replace the mail settings with your own.
you can also use gmail
MAIL_DRIVER=smtp
MAIL_HOST=smtp.googlemail.com
MAIL_PORT=465
MAIL_USERNAME=ENTER_YOUR_EMAIL_ADDRESS(GMAIL)
MAIL_PASSWORD=ENTER_YOUR_GMAIL_PASSWORD
MAIL_ENCRYPTION=ssl