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.

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