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Strange sendmail behaviour
I have an interesting sendmail scenario. I am testing out MX records in a
lab. I have three hosts:
b and c both act as secondary mx for a. each has a dns entry. they each
also have cname entries as mx1.test.lab and mx2.test.lab respectively.
dns is configured for db.test.lab as
@ IN MX 10 a.test.lab
IN MX 20 mx1.test.lab
IN MX 30 mx2.test.lab
i test their ability to act as secondary mail server by sending a message
with the following as the recipient:
this works properly and the mail arrives to a.test.lab in the gaucho
oddly, when i send a message to
the message is bounced saying that there is a local configuration problem
on the mx1 machine. neither b.test.lab nor mx1.test.lab have reverse
lookup entries in dns. i had at first thought that there was a problem
with forward and reverse entries not matching. this does not seem to be
Each secondary machine is configured with a /etc/mail/relay-domains with a
I have also tried using the /etc/mail/access file as a relay authority
in the file. Still, same outcome.
Each machine has an empty /etc/mail/local-host-names
Can someone provide insight as to what is occurring and how to fix this
such that mail sent to @mx1.test.lab will properly be relayed? All
machines are running RedHat 7.3 and the lastest patched sendmail RPM
available from RedHat.
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