Forwarding to other helm accounts?

Sorry if this is somewhere else, but I’ve been having a bit of trouble finding info, so I’m posting my question here…
Basically, I’m thinking of setting up a few email accounts for a user for various purposes but I’d like to have email forwarded (on the Helm side) from them to a main account. The reason why I don’t want to do this via alias, is that I’d like the option of later separating them if I wanted to. This way the user could set up on his email client just the main email address and get everything, but also set up the other accounts if they wanted to separate them. Is Helm-side forwarding a capability? And if so, how can that be set up?