dovecot - Feb 2011 - Dovecot Or Debian, Boot-Time Error "Can't assign requested address"

Hi all,

I have a really weird problem, which for now I have solved by just binding to
the IPv6 wildcard address "::".

Using the latest packages from Debian unstable (1.x series), I set up a tunnel
with tunnelbroker.net for IPv6.  I assign two of the delegated addresses in my
/48 using IP aliases in /etc/network/interfaces to my ethernet interface (eth0
and eth0:1).  All other servers start and run, binding to the primary address
(eth0) assigned.  The packet forwarder is not necessary, so it isn't turned
on using sysctl.  But Dovecot will only start if I launch it using the init
script after boot.  Until then, in syslog there is always:
Fatal: listen(2001:470:xxxx::1): Can't assign requested address

Anybody have the slightest clue what's going on here?  Debian bug, or
Dovecot?  I suspect some problem with initscript order, yet inspection shows no
apparent problem; network starts up before services.  Very, very odd.

Cheers,
Sabahattin