Hi all,
I need to prevent SME Server 8 to deliver e-mails to external domains: if a local user adds an external account to its delivery list (for example he adds account@gmail.com using his preferred MUA) the system refuses the e-mail and replies to the user.
In other words, the server must be a relay only for the local domain (the default behavior allows emails to go out the domain). No e-mails should go out the domain.
The solution should not use a firewall rule (don't want to deal with timeouts, queues, and so on...).
Thank you all!