I found a way to do that.
Now we have 2 subdomains with the same addresses, @domain.com and @intranet.local.
In the address
info@domain.com we configure to check the address
info@intranet.local via Pop as an external email and save the messages directly in the Inbox folder.
Now we have 2 questions:
1 - It's posible to autocomplete the @intranet addresses in @intranet.local? How?
2 - It's posible to check the Pop accounts configured as external email even with the web client closed? the idea is to receive the @intranet.local mails directly in other clients as Thunderbird.
Thanks in advice.