[Exim] Limited relaying

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I'd like to permit relaying from any host that authenticates with a valid
username & password. How easy and secure is it?

I'm using Exim v4.0 and Slackware 8.0



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Use custom emotions -- try MSN Messenger 6.0![1]

===References:===
1. http://g.msn.com/8HMAENUS/2749??PS=