[exim] Local senders whitelist: practical limits

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Autor: Rob Munsch
Datum:  
To: exim-users
Betreff: [exim] Local senders whitelist: practical limits
Hello list.

Due to increasingly fascist local antispam policies, we are of course
bouncing a lot of people's mail. Such people are invariably the friends
and/or business contacts of Important People in the office.

I'm using an

   accept
     senders = lsearch*@;/etc/exim4/local_whitelist


before my ACLs start getting nasty, which a flat file containing the
addresses of People Who Should Never Be Blocked. But naturally now that
the existance of this file is known, everyone wants in on it. One
enterprising department forwarded me a spreadsheet of 2000 addresses
"who we never want to get bounces," most of them from @gmail.

So:

1) How large can this local_whitelist get before i start doing Horrible
Things to my server's performance?

and

2) Is there a better, more efficient way to call a whitelist other than
referring to a flat file?

TIA.