[Dovecot] Patch for vpopmail roaming users support

[Timo Sirainen]

On Tue, 2011-06-07 at 09:10 -0500, Matt Brookings wrote:
> >> Unfortunately, the 5.4 branch does not understand "::1" as the loopback,
> >> and it parses the value incorrectly, leading to an open relay situation.
> >>  Not all systems allow localhost to relay via SMTP without authentication.
> > 
> > Doesn't it also mean that if someone connects via a remote IPv6 address,
> > it again leads to open relay? How about the attached patch instead?
> 
> Many systems will be running other qmail and vpopmail services from the
> ucspi-tcp package which may not be patched to support IPv6.  As a
> result, when connecting to "::1", it will be translated to 127.0.0.1,
> and as I said before, some systems will not allow localhost to send
> without authentication.
> 
> I understand it's introducing a hackish fix into your project, but I
> will submit a new patch that updates this block of code when a proper
> solution that will work across the various system configurations is
> determined.

It still seems safer to me to ignore all IPv6 addresses rather than ::1
specifically. And as I understand it works just as well normally with
both ways?