Ronald F. Guilmette:
> Let's say that the the dynamic IP that I *was* using, just before the
> power fail, was a.b.c.d. The question is: While I am wandering around
> with my flashlight in the dark, what if some other customer of my ISP
> happens to request a DHCP lease and also happens to get a.b.c.d ... which
> is possible, because after all, *I* am not using that specific IP address
> anymore, so it will have been returned to the DHCP free pool.
>
> In this scenario, could that other party who got a.b.c.d, dynamically,
> turn on a mail server and begin sucking down *my* emails from *my* cloud
> VM Postfix instance?
Alternatives:
- Use a tunnel (ssh port forwarding, or vpn) which is initated
by the home machine. This sidesteps any dynamic DNS issues.
- On the cloud MTA, require certificate authentication, so that
it will not send mail to the wrong 'home' server.
Wietse
