if the second blaat via DNS is resolvable, it will work fine. A company I consulted at had a mail server that was internal only, and via their DNS server, they

if the second blaat via DNS is resolvable, it will work fine. A company I consulted at had a mail server that was internal only, and via their DNS server, they had resolvable names for department1, department2 etc... They used to send messages to addresses like user@department1, user@department2 etc, and as each resolved fine and it worked very well.