Email forwarding

So I use different email aliases for everything so when they sell out my email/get hacked/keep spamming me when I unsubscribe I can then forward that alias back at their own emails so they get the spam instead of me. Now this is no longer working. Please fix as Miller is now spamming me and their unsubscribe page says I already unsubscribed.

“Only forward mail to addresses handled by this Mail-in-a-Box, since mail forwarded by aliases to other domains may be rejected or filtered by the receiver. To forward mail to other domains, create a mail user and then log into webmail for the user and create a filter rule to forward mail.”

Great news: it’s already fixed! Use the filters in Roundcube for forwarding messages to domains not hosted by MiaB.