On Thu, Apr 18, 2013 at 04:31:41PM +0200, L.W. van Braam van Vloten wrote:

> Could you please advise what would be the preferred, secure approach to
> achieve this?

When you say "secure", what security mechanisms are acceptable?  You
could operate a TLS protected submission service that the other host
can reach via suitable SASL credentials or a TLS client certificate.

Or as Ralf suggests you could just allow it to relay by its IP
address.  IP addresses change from time to time, but key management
is not a bed of roses either.

-- 
        Viktor.

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