I previously had configured postfix filter for mail users.

example:
"usuario1@midominio.cu" You can only send and receive messages from domains. cu

"usuarios2@midominio.cu" can receive messages from anywhere.

how I can do this using Iredmail?

We also need to set other mailboxes to local server, containing its message in my server with fetchamil and distributed locally to its customers.

example
Public Server: midominio.cu
Local Server: sub.midomain.cu

in the public server had set up a mailbox for the local server.

sub@midomail.cu

all messages sent to local server user entered serv@midomail.cu sub.midomain.cu
Messages are collected mediate these fetchmail from the local server and distributed locally
user1@sub.midomain.cu
user2@sub.midomain.cu

Internet_mail===»ServerPlublic(midomain.cu)====(mailbox_sub.midomain.cu)====»Fetchmail====»LocalServer=====»users of @sub.midomain.cu

know how I can do this now with iredmail?