>Is it possible to simply have a list for "Check First" and then deliver
>domains that users with that domain will have their userID checked for
>validity first.
>
>If we can check the domains of Hotmail, and Yahoo first and see if they
>exist before delivering their message our traffic will fall dramatically.
>
>I see such lines in our log files quite a lot:
>
>-----
>05:22 06:53 SMTP-(0000014A) >RCPT
>To:<<mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED]>
>05:22 06:53 SMTP-(0000014A) 553 VS10-RT Possible forgery or deactivated
>due to abuse - see
><http://help.yahoo.com/help/us/mail/spam/spam-18.html>http://help.yahoo.com/help/us/mail/spam/spam-18.html
>
>(#5.1.1)
>05:22 06:53 SMTP-(0000014A) >QUIT
>-----
>
>But these are coming after Declude Junkmail rejects their email and this
>is the bounce message for the notice.
Are you using the BOUNCE action? If so, you may want to stop using
it. Most spammers don't have valid return addresses.
>Why can't this be done before hand?
The problem is that there is no reliable way to find out if an addresses
exists or not (and, if you try, it is very resource intensive).
The MAILFROM test checks to see whether or not mail can be sent to a given
domain. That requires 2 short UDP packets (one out and one in), which are
typically handled in less than a second. To try to figure out of the
address is valid would require connecting to the mailserver using TCP and
initiating a pretend SMTP connection, which would take at least a dozen TCP
packets, and would take quite a bit longer. It's not foolproof -- many
domains will accept E-mail for users that don't exist, and either bounce it
later or not even bounce it (the "nobody" alias).
-Scott
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