Scroll down to Step 6, where it shows "Any addresses (not recommended)"
Apparently, it works, but with some notable caveats, like: "If the envelope sender is not in one of your domains, the system changes the envelope sender from user@[domain you don't own] to postmaster@[your domain]"
Scroll down to Step 6, where it shows "Any addresses (not recommended)"
Apparently, it works, but with some notable caveats, like: "If the envelope sender is not in one of your domains, the system changes the envelope sender from user@[domain you don't own] to postmaster@[your domain]"