I realize this article is coming from a corporate perspective but from a home user's perspective, I am really getting quite a lot from IPV6. I once had to poke holes in my firewall to get at internal machines on nonstandard ports when away from home. Now that they are IPV6 enabled,, I can address them directly. I can also access my Samba shares (ISP port blocking) and the SIP protocol works much better now that NAT is not involved.

The tunneling does add latency though so here's hoping the ISPs get native connectivity soon now.

Actually, DKIM can be used to guarantee a sender. We're using DKIM here with ADSP. That is:
_adsp._domainkey TXT "DKIM=ALL"
tells a receiver that all emails from our domains should be signed. Since the keys themselves are published in our DNS, a machine not under our control should not be able to send an email purporting to be from our domain.

I'm not sure but I would think that mechanism would make SPF irrelavent. Assuming antispam software actually checked the adsp dkim records.

That's the thing I don't understand about the whole Symbian open sourcing and the excitement around it. Unless I am off-base, it's not like a programmer will be able to pick up the Symbian codebase, make a modification, compile a new kernel and flash it into his phone. If that's the level of open-sourcing we're talking about here, disabling 'Symbian Signed' will be trivial. Is this geared more toward device manufacturers? IE. end-users and developers need not care?