We have setup mercury to receive emails by SMTP and then distribute the emails to POP3 mailboxes.
However, I don't seem to be able to find an option to tell mercury what domains to accept emails on and which to reject.
I've found the global filtering rules for distribution, but the only way I can find to receive emails is to untick this option "do not permit SMTP relaying of non-local mail" - however when I do this, although I do receive emails, my IP address is then advertising as an open smtp-relay when I run an SMTP check on the IP at mxtoolbox.com website.
Hopefully I am missing something here, and hoping someone can point me in the right direction.
Hopefully once this is all sorted, I can then purchase a licence to help support the development of the product.