$ host -t MX macos.cmi.ua.ac.be
returns no answer
This is the same as with another host on the same subnet, also in the
same zone and on the same switch... and which does receive a sent mail
But, when I try from host1
$ telnet host2.domain.topdom 25
telnet: Unable to connect to remote host: Connection refused
Op host2.domain.topdom I see sendmail is running:
host2: $ ps -jaxw | grep sendm
smmsp 816 1 816 816 0 Is ?? 0:00.02 sendmail: Queue
run...@00:30:00 for /var/spool/clientmqueue (sendmail)
root 812 1 812 812 0 Ss ?? 0:00.01 sendmail: accepting
What's wrong? Why does this not work out of the box ??
On Tue, 13 Jan 2009, Mel wrote:
On Tuesday 13 January 2009 13:20:33 Pieter Donche wrote:
'Returned mail: see transcript for details":
----- The following addresses had permanent fatal errors -----
----- Transcript of session follows -----
550 5.1.2 <u...@host2.domain.topdom>... Host unknown (Name server:
mailhost.domain.topdom: host not found)
host1 and host2 are both behind a firewall, but they are in the same
zone (so firewall rules do not apply), both are even connected to same
switch and their IPs are in the same subnet.
Both have fixed IP address (not DHCP)
mailhost.domain.topdom does not exist in DNS, but host1 can send
mail to other mailservers all over the world.
MX record for host2.domain.topdom resolves to an unknown
See: host -t MX host2.domain.topdom on host1.domain.topdom.
Problem with today's modular software: they start with the modules
and never get to the software part.
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