Re: [courier-users] courier and greylisting and callback.

On 15.2.2008 0:25, -=Devil_InSide=- wrote:
> callback - a check of sender.
> when local mail server recieve message, it temporary stop recieving after any header ( "to" usually) and try initialize simulation session of sending mail to adress $from.
> if remote server hasn't that address in recipient's list, the incoming connection is closing and incoming mail rejects hard (usually).
>

Which is a very bad idea. For many reasons:
- Blacklists etc. create havoc with the checking
- Timeouts
- It is extremely easy to conduct DDoS against a mail server, if this
becomes widespread (think a spammer sending a large number of spams
forging your domain, which is bad even now, and it'll be a disaster if
everybody used callback).
Probably there are other reasons I haven't thought of

esa

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