On Oct 3, 2013, at 06.30, Mark Goodge <m...@good-stuff.co.uk> wrote:

> I know I could solve the problem by using authentication, but a lot of the 
> outbound email is generated by cron scripts on a server inside the network, 
> and rewriting all of them to authenticate when sending mail is likely to be 
> considerably more effort than updating mynetworks as and when the IP changes.

use a simple null client.  i'd recommend msmtp.  no configuration changes to 
the cron jobs or scripts they run is necessary.

-ben

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