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1) Add an option to turn on and off whitelisting.
do you mean on a per user basis? - that's probably the way to do it. I think the example url i gave had 'all' accounts being whitelist only, but some people might not want that i guess, so having it as an option would be good.
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2) incoming.pl (and pop3 checking code) would need to be modified to check the From address. The easiest way for doing this 'authentication' would be to setup the whitelist like Hotmail does - everyone on your address book is whitelisted.
yip - sounds good! option 'on' turns all current addresses into the whitelist. off just sets everything back to normal.
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3) When sending mail to someone, you probably want to check if they exist in your address book. If they don't, they should be alerted the recipient won't be able to reply unless they add the address.
hmmmm... thinking aloud... I wonder if when you send an email to someone, it automatically enters the recipients email address into the whitelist? That would solve the problem of someone not being able to reply.
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But would should happen if someone sends an email to a whitelist enabled account where they're not whitelisted? Should it bounce, bounce with a whitelist error? I could see why you'd want it to do nothing (spam), but with legit email, it'd be nice to know about it. Thoughts?
yip, fair point. A bounce with "you need to be on the recipients white list" would be a good idea. I'm not 100% sure what happens when spam gets bounced, I assume it just drops that email address from the list?
regan.