This seems obvious or something I just don't understand.
I want to build SPF records for my clients. Most of the email providers provide an SPF record that I can "include" in mine, but they all include ~all or -all at the end.
Does this mean that their "include" always has a match and therefore everything after is not looked at? I think this causes trouble for clients that send valid emails using two services or use some form of email forwarding (ex: their registrar provided email + gmail.)