SMTP setup error

Hello,

I’m developing a landing page and at the moment I’m working on localhost.

I installed Contact Form 7 to send emails directly from the page, but these end into the spam folder in Gmail.

To sort out the problem I installed WP mail SMTP plugin.

I tried to set up the SMTP for gmail but when I tried to test the sending of an email I got the following message: “There was a problem while sending the test email.”

It says it could not autenticate your SMTP account.

I know there are two ways to set this up, one using an API key and the second using other SMTP options.
Seen I’m working on localhost at the moment I opted for the second option.

The informations I provided are:
SMTP host: smtp.gmail.com
Encription: TLS
SMTP port: 587
SMTP user name: the mail address I use to enter the gmail account
SMTP password: the password I use to enter the gmail account

I am sure I did something wrong, but this is the very first time I use this plugin and this method.

Thank you for your help!