I have automatic email forwarding set up on my old @vodafone.co.nz email addresses. In the past few weeks I've been inundated by spam email being forwarded from these @vodafone.co.nz email addresses. Most of them are prefixed with the bogus email addresses "newsletter@". Anyway it seems like the Vodafone email spam filtering isn't functioning to filter these out. How do I stop Vodafone email forwarding and just kill these email addresses? Thanks.