[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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
the case.

Each secondary machine is configured with a /etc/mail/relay-domains with a
single line:


I have also tried using the /etc/mail/access file as a relay authority

test.lab RELAY

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.

Thank you.

To unsubscribe, send email to majordomo@luci.org with
"unsubscribe luci-discuss" in the body.