Redmine

I've read ALL topics here with this same error but I can't manage to solve my problem, I think I've done everything right, but I still keep seeing this error

(getaddrinfo: Name or service not known)

This is my configuration:

default:
  email_delivery:
    delivery_method: :smtp
  smtp_settings:
    address: smtps. //domain// .it
    port: 465
    ssl: true
    enable_starttls_auto: true
    domain: //domain// .it
    authentication: :login
    user_name: name@ //mail// .it
    password: //password//

My redmine is installed on TS-541+ (QNAP)