🚀 go-pugleaf

Correctly addressed mail to some sites in Switzerland is sometimes being
bounced, apparently because of an error in the nameserver configuration.

For example, ethz.ch has the following MX records:

	ethz                MX    10   chx400.switch.ch
	ethz                MX    20   relay.EU.net

Now chx400.switch.ch has an A record, but relay.eu.net does not seem to exist.
It has no A record; the only information in DNS relating to it seems to be

	relay.eu.net	preference = 10, mail exchanger = mcsun.eu.net

If chx400 is down or unreachable, sendmail tries relay.eu.net, and the message
is returned to the sender with a "Host unknown" error.  Note that sendmail
should *not* be expected to take note of a "second level" MX record like the
one for relay.eu.net.

Should the ethz preference 20 MX record (and other similar records for other
Swiss domains) refer to mcsun.eu.net instead of relay.eu.net?

Mail to the domain contact and the postmaster hasn't had any apparent effect.

Apologies in advance if I've misinterpreted the problem and it is at my end
somehow: if so, advice would be appreciated.
--
Jim Richardson
Department of Pure Mathematics, University of Sydney, NSW 2006, Australia
Internet: jimr@maths.su.oz.au  ACSNET: jimr@maths.su.oz  FAX: +61 2 692 4534