On Tuesday 13 January 2009 13:20:33 Pieter Donche wrote:

> 'Returned mail: see transcript for details":
>     ----- The following addresses had permanent fatal errors -----
> <u...@host2.domain.topdom>
>     ----- 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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