Using valid emails

[D'Arcy J.M. Cain]

On Tue, 2 Aug 2016 02:22:50 +1000
Chris Angelico <rosuav at gmail.com> wrote:
> > I'm a little insulted that you think that I would ever allow
> > someone to send mail to Vex.Net pretending to be from Vex.Net.
> > That's just too easy to detect and block.  Try it.  
> 
> vex.net. 10800 IN TXT "v=spf1 mx -all"
> vex.net. 10800 IN MX 10 mail.vex.net.
> mail.vex.net. 10800 IN A 98.158.139.68
> 
> So, if you're not sending mail from 98.158.139.68 and you claim to be
> vex.net, you should be blocked.

Exactly.  I also have a further check.  If you try to send me email
pretending to be from Vex.Net you get a "5xx Yah Right" error.

> Unfortunately, a lot of domains don't have SPF records, or have very
> convoluted ones (check out gmail.com's SPF for instance).

I can only fix my little corner of the Internet.

-- 
D'Arcy J.M. Cain
System Administrator, Vex.Net
http://www.Vex.Net/ IM:darcy at Vex.Net
VoIP: sip:darcy at Vex.Net