Need smtp information to input in to plugin correctly to recieve email notifications

I am having an issue with receiving email notifications from my website i keep getting error codes from my wp mail smtp plugin saying the settings are not correct or the host is blocking the connection. Wouod it be an issue with the dns records ? I am so baffled by this as it has been working perfectly up until a few days ago

The setting i have
From mail - email
From name -business name
Smtp host - smtp.Gmail. com.
Smtp port - 465
Smtp username -email @gmail. com
Smtp password - gmail password