All questions related to installations, configurations and maintenance of Advanced Host Monitor (including additional tools such as RMA for Windows, RMA Manager, Web Servie, RCC).
gmail.com requires TLS/SSL authentication, which is not supported by MailRelay test method. I think, that's the cause why you are getting "Unknown" status. We plan to implement TLS/SSL authentication for SMTP services, but I am not sure when it will be done.
Baptiste wrote:do you know web mailbox which can be tested by mail relay ?
Sorry, I do not know. I suppose, all the web mailboxes use TLS/SSL auth because of security reasons. Most of our customers use corporative mail servers and do not use public mailboxes.