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.
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