You lost me. You say "the phase (SPAMTAGPTD),attach to it" but then you say "the email come without the phase, so they get thru."
So, is their spam blocker making any difference or not? Is it stopping any mail from coming through?
I guess EarthLink really does it best. Here's an image of my EarthLink WebMail panel: >
here<
Do you have an online address book, as I do? If not, then how is your ISP's spam blocker supposed to stop spam? By some filtering? Can you see evidence that it's working?