Hi.
Are these emails going to a single email account and then you want it forwarded to various people?
Yes -> Using the GUI method above in SOGo will work but will be time consuming. You can instead edit the email addresses sieve filters directly through text and manipulate them that way. However, it’s not possible to do this via mailcows GUI. You will need to find an app that can do this. KMail on KDE has this ability.
You -can- use mailcows GUI to create a pre-filter for emails and do this the same way, though.
If the emails are NOT going to a single email address then you will need to make a global pre-filter to do this.