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Date: Thu, 1 Mar 2012 13:28:12 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: stable@freebsd.org
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Subject: Re: sendmail and smarthost
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On Thu, 1 Mar 2012, Warren Block wrote:

> On Mon, 27 Feb 2012, Warren Block wrote:
>
>> In 8.3-PRERELEASE, sendmail is now happily ignoring a smarthost unless 
>> DONT_PROBE_INTERFACES is set.  That used to be unnecessary.
>> 
>> That machine rarely sends email, but a bug followup sent on Feb 25 went 
>> through.  Maybe not significant since it was outside the local domain.
>
> Adding an IPv6 entry for the hostname to /etc/hosts prevents the problem 
> without requiring DONT_PROBE_INTERFACES.  (Thanks to George Shapiro!)
>
> This brings up the question of why an IPv6 hosts entry is needed on an 
> IPv4-only system, but that's for another thread.

Or not, updating and rebuilding seems to have everything back to normal. 
Most likely I built a GENERIC kernel with IPv6 instead of a custom one 
without.