sendmail and smarthost

[Warren Block]

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.