What's the result of that? Won't listen in IPv6 interfaces? Any way you can force it via cmd line options or the CF file?
It seems to listen, but doesn't recognize the IPv6 address as localhost equivalents, which can lead to suprising warnings -
'(may be forged)'. I had email comming/going via ipv6 for a while (nothing recent, not sure why), so its more a cosmetic and ease of management issue.
Obligatory "you could use Postfix/Exim/etc/etc". At least you're not using netqmail like me. It appears not to have any IPv6 support at all, except for some preliminary patches from an end user.
I plan to migrate my server over to something like Postfix.
Hehe, as the Debian sendmail maintainer, that'd be rather odd... (though I also - poorly - maintain the ldap-nss and pam-ldap packages that I'd like to deprecate in favour of libnss-ldapd - as that is what I now use).
Postfix is the only other MTA I'd consider, being that it also supports the milter interface and has a decent design - for the old-timer's amongst us, sendmail has changed alot since the 8.6|7|8 exploit dujour days.
I use sendmail, milter-greylist (I was a late convert to greylisting, despising the delay), mimedefang (to call spamassassin and clamav, and do some anti-spoofing, backscatter reduction, and filter-bypassing for daemons/authenticated users)... mimedefang gives you the full power (and, to some, horror) of perl.