can you explain more about the alias feature? what makes it special? Because I think this could be a killer feature as I have that exact same problem when signing up to websites
Very easy: After signup you go to Settings > Users and Aliases. There you see a list of your alias names. And you can create a new one with a click. Underneath the alias name you select which email address to forward to (I manage several email addresses for my family). That‘s it. You can even setup aliasses in a way that you can send messages from them, so they do not serve for receiving emails alone.
Their service is excellent. You get answers from real human beings within 24 hours (unlike trying to get help for Gmail; won‘t work).