thanks, i try it in a last queue - if other way will not be acceptable.
^)

,------[Esa <[EMAIL PROTECTED]> Fri, 15 Feb 2008 00:28:17 +0100]
|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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