Am 24.11.2011 04:48, schrieb Islam, Towhid: > Thanks Viktor, for you have diagnosed my problem to the point. > >>> Typically this also means that the DNS view of the domain's MX >>> records as seen by the servers is likely the external one, but >>> they probably need an internal view that presents only the internal >>> SMTP servers for the domain. > > This exactly the problem however, I am not how to set up the dns for the host > correctly such that any lookup will yield the host's internal (NATted) > address.
what exactly do you not know? do you not have a dns-server in your internal network? > What I wonder however, is why does this problem appear intermittently? i guess there is / was a cisco-router touched or replaced which did translated dns responses with public addresses he knows the internal one - afaik this can be disabled and is only available on cisco-routers
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