Sam Varshavchik writes:

Bernd Wurst writes:

Hi.


On Thursday 24 April 2008, Sam Varshavchik wrote:
Define "primary MX". The MX record for the other machine must have a
numerically lower priority (higher order priority) than the MX record for
this machine.

Well, I think I did this step correctly.

To be precise, this is my setup:


# dig -t mx suessmost.de
[...]
;; ANSWER SECTION:
suessmost.de.           3600    IN      MX      5 d.ns.schokokeks.org.
suessmost.de.           3600    IN      MX      10 zucker.schokokeks.org.
[...]
zucker.schokokeks.org.  60      IN      A       85.10.204.247
zucker.schokokeks.org.  3600    IN      AAAA    2001:6f8:1060::1
d.ns.schokokeks.org.    3600    IN      A       85.10.228.82


The entry of the priority 10 mx does not affect anything.

In the above scenario, the courier daemon listenes to port 25 only on specified IP addresses:

# netstat -nplt|grep ':25'
tcp        0      0 78.46.69.2:25  0.0.0.0:*  LISTEN    19945/couriertcpd
tcp        0      0 127.0.0.1:25   0.0.0.0:*  LISTEN    19945/couriertcpd

The couriertcpd configuration is not relevant. The esmtp client has no knowledge of how the tcpd daemon is configured.

But:
78.46.69.2 and 85.10.228.82 are configured on the same device:

There you go. Courier obtains a list of all locally-configured IP addresses. It sees 85.10.228.82, and sees that it's the highest priority MX, so it concludes that this domain should be configured as a local domain.

I neglected to mention that you just need to put an explicit entry in esmtproutes that duplicates the primary MX record. Courier ignores this check if the recipient domain has an explicit entry in esmtproutes.


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