Hi Xavi,
At 01:45 12-12-2006, Xavi Montero wrote:
I have SpamAssassin in my Debian box (with sendmail). I have config A) where spamassassin is run in the delivery stage of the sendmail (see the apendixes below) and I desire behaviour B) where it is run at the incoming stage so the spam is rejected and the sender cannot success at sending it.

QUESTION-1: Is this possible?

Yes.

QUESTION-2: May I break this goal into small parts and achieve each separately?

Yes.

QUESTION-3: Where do I have to start?

See below.

Appendixes:

B) Desired config

When you send mail to a server to a wrong user, sometimes it re-sends you back an e-mail that says: "Cannot send because user does not exist". But sometimes you get this message DURING the connection so you know for sure that the mail was NOT delivered. I suspect

See http://wiki.apache.org/spamassassin/IntegratedInMta There are several milters which allow SpamAssassin to be called during the SMTP phase instead of the delivery stage (Appendix A).

My desired behaviour would be:

- Setup SpamAssassin at the "input" of the sendmail, so anybody sending spam to me gets a "send failure".

That's how it works when you use a milter.

- Configure the message saying "Your are suspected to send spam, if you do not, go to this webpage (and give one under my apache) and enter your e-mail address".

You should be able to tailor the reject message to say that.

- Provide a phpscript that if one is entering a good e-mail address by hand, the address is added to a "white-list" that allows his mails to arrive me.

See http://wiki.apache.org/spamassassin/UsingSQL Your PHP script can add the whitelisted address to the SQL db.

E) What did I try (and did not run).

if ( $SIZE < 262144 )
{
    ## 4.1 Spamassassin
    xfilter "/usr/bin/spamc"

    if (/^X-Spam-Flag: YES/)
    {
        echo "This server thinks this is spam."
        echo "If this is not spam, call me at +34 630 59 01 62"
        EXITCODE = 100
        exit
    }
}

You cannot set a message during the delivery stage.

Regards,
-sm

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