receiving mail

[Pieter Donche]

on host1:
$ 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

Trying 143.129.75.1...
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 
runner at 00:30:00 for /var/spool/clientmqueue (sendmail)
root    812     1   812   812    0 Ss    ??    0:00.01 sendmail: accepting 
connections (sendmail)

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 -----
>> <user at host2.domain.topdom>
>>
>>     ----- Transcript of session follows -----
>> 550 5.1.2 <user at 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
> mailhost.domain.topdom.
> See: host -t MX host2.domain.topdom on host1.domain.topdom.
>
> -- 
> Mel
>
> Problem with today's modular software: they start with the modules
>    and never get to the software part.
>