automatically copy incoming mails to another INBOX?

[europacafe]

I have [email protected], [email protected], and [email protected] imap accounts created on Stalwart.

If I want all incoming mails addressed to xxx and yyy to be automatically bcc to zzz, how could I accomplish this?

It may not be by adding bcc to zzz. My goal is every incoming mail for xxx and yyy will "also" appear in zzz inbox.

update#1:
I'm able to accomplish this on Snappymail webmail client side. However, it has to be set on both xxx and yyy accounts separately. The sieve filter script I use is just:

require ["copy"];
redirect :copy "[email protected]";

I still wish to do it on Stalwart, but I'm not sure how to accomplish it. So far, I have created a script named "copytoall", via Settings/Sieve Scripting/Scripts/+New script, which has following command:

require ["copy"];
if address :matches "To" ["[email protected]", "[email protected]"]
{
    redirect :copy "[email protected]";
}

After creating the above script, I "save&reload" and "reload config" and even restarted my Stalwart mail container, but it didn't work. I'm not sure what I did wrong or if I need to do additional settings at some other places too. All my settings were performed via Stalwart admin GUI.

Update#2: stalwart sieve is working now by running the script at DATA stage, not at RCPT

[europacafe]

Is there a difference in the processing sequence when placing 'copytoall' after the spam-filter compared to placing it before the spam-filter?
Update#1:

1. From the above sieve setup, if an incoming mail was put in the spam folder, the mail won't be copied to 'all' inbox. Why?
2. I found that if I put 'copytoall' before 'spam-filter', 'copytoall' won't copy mail at all, why?

[mdecimus]

You can't specify multiple scripts in an expression. You should call only a single script which includes all your other scripts.

[europacafe]

Thanks a lot. I've created a new script to include both scripts and it is working fine now.

[williamdes]

Can you share the script too?

[europacafe]

Can you share the script too?

spam-filter script is already there when you install stalwart.
copytoall script is shown on my original post above.