Bug#869666: SYSERR(root): timeout writing message to
On Fri, Mar 23, 2018 at 10:03:40AM -0600, Will Aoki wrote:
> We can confirm the same problem and that it was fixed by downgrading the
> sendmail packages to 8.14.4-8+deb8u2. The problem's a bit tricky in that
> the log message suggests that the destination server is at fault, where
> it's really Sendmail trying to look up names in To: that aren't in the
> envelope.
This appears to be a change in 8.15.1 regarding header rewriting, and
several other folks were caught by surprise:
https://forums.freebsd.org/threads/timeout-writing-message-to-local.55563/
https://groups.google.com/forum/#!topic/comp.mail.sendmail/_Io7xEYqF1s
To deal with this, it's necessary to turn off hostname canonicalization.
As I understand it,
Khost host -t
should result in the previous behavior, but the documentation recommends
turning off hostname canonialication with
FEATURE(`nocanonify')
This change does work, although I haven't yet tested operationally to
verify nothing of ours was relying on the old behavior.
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