Can’t send email

Hello,
we can’t send email using both Gmail or standard SMTP Authentication.

Using Gmail API:
Versions:
WordPress: 4.8.5
WordPress MS: No
PHP: 7.0.27
WP Mail SMTP: 1.2.5

Params:
Mailer: gmail
Constants: No
Client ID/Secret: Yes
Auth Code: Yes
Access Token: Yes

Server:
OpenSSL: Yes
PHP.allow_url_fopen: Yes
PHP.stream_socket_client(): Yes
PHP.fsockopen(): Yes
PHP.curl_version(): Yes

Using SMTP auth:
Versions:
WordPress: 4.8.5
WordPress MS: No
PHP: 7.0.27
WP Mail SMTP: 1.2.5

Params:
Mailer: smtp
Constants: No
ErrorInfo:
Host: localhost
Port: 25
SMTPSecure: string(0) “”
SMTPAutoTLS: bool(true)
SMTPAuth: bool(false)

Server:
OpenSSL: Yes
SMTP Debug:
[empty]

Best regards,
Luca