Comment # 4 on bug 853020 from Tim Serong

I realise this bug was closed quite some time ago, but a friend pointed me at
it today, so thought I'd add the following.  I'd guess that if it works when
you remove perl-IO-Socket-INET6, then amavis is enabling IPV6 based on the
existence of that Perl module, rather than on whether or not IPV6 is actually
enabled on the base system.  Is this something that should be pushed upstream,
to change how it checks for IPV6 enablement?