Impossible to separate iCloud+ webmail custom domain incoming and outgoing mails

I have several domains with mailboxes, but I have a very important which I don't want to loose, so I added two unused custom domains to iCloud+ for try, and I did it. All the incoming and the outgoing messages collected to the same folder. There is an option to create rules in the webmail, so I wanted to separate the incoming and the outgoing mails into different custom folders by domain. I wanted to collect all the received both the sent mails of the abc.com domain to an ABC custom folder, so I created a rule, if I receive a mail to the me@abc.com move to the ABC folder. It works fine. I created the next rule for the outgoing mails to put them into the same folder when I sent a mail from the abc.com domain, but in this case nothing happend. The sent mails are still among the cummulated outgoing mails. I tried everything, delete all the rules and started from zero without any result.

I anybody has any solution for this, please let me know.

This iCloud+ mail more basic than any other webmail 20 years back, isn't worth a penny, if you didn't change yet, don't change.