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Vpopmail smtpd-chkusr with TMDA Python

 qmail mfcheck patch

Block mail from invalid domains that can not be replied to use the mfcheck patch.

cd /usr/local/src/mail/qmail-1.03
patch < qmail-1.03-mfcheck.3.patch

This patch goes in by itself after the smtpd-chkusr patch (ALMOST) except for a few hunks in qmail-smtpd.c and the Makefile which can be done by hand. Check your *.rej files. It may take you a few minutes but the patch is well worth it!

make qmail-smtpd
services stop
cp /var/qmail/bin/qmail-smtpd /var/qmail/bin/qmail-smtpd.bak
cp qmail-smtpd /var/qmail/bin
chown vpopmail:qnofiles /var/qmail/bin/qmail-smtpd
chmod 6555 /var/qmail/bin/qmail-smtpd
services start

Test it with my own admin emailer
#!/usr/bin/perl
# title   : admin_emailer script 
# author  : John David Saario
# company : Alamak Internet
# policy  : free to copy and redistribute

if ($ARGV[0] =~ /\S+\@\S+/ && $ARGV[1] =~ /\S+\@\S+/) {
        $from = $ARGV[0];
        $to = $ARGV[1];
        if (-e "/var/qmail/bin/qmail-inject") {
                &sendit($from,$to);
        } else {
                &sendit2($from,$to);
        }
} else {
        die "Syntax, [from] [to]\n";
}
sub sendit {
        my ($from,$to) = @_;
        my $subject = "Testing $from -> $to"; 
        my $msg = "Testing $from -> $to\n";
        $name = "Goofy";

        open (QM, "|/var/qmail/bin/qmail-inject -f$from");
        if ($name) {
                print QM "From: \"$name\" <$from>\n";
        } else {
                print QM "From: $from\n";
        }
        print QM "To: $to\n";
        print QM "Subject: $subject\n";
        print QM "\n";
        print QM $msg;
        close QM;          
        print "Email sent to : $from -> $to\n";
        return;
}
sub sendit2 {
        my ($from,$to) = @_;
        my $subject = "Testing $from -> $to"; 
        my $msg = "Testing $from -> $to\n";
        $name = "Goofy";

        open (QM, "|/usr/sbin/sendmail -oi -t -f$from") || die "no sendmail\n";
        if ($name) {
                print QM "From: \"$name\" <$from>\n";
        } else {
                print QM "From: $from\n";
        }
        print QM "To: $to\n";
        print QM "Subject: $subject\n";
        print QM "\n";
        print QM $msg;
        close QM;          
        print "Email sent to : $from -> $to\n";
        return;
}

Check It.

./admin_emailer root@validdomain.com root@mydomain.com

Successfully delivered.

./admin_emailer root@bogusdomain_xxx.com root@mydomain.com
From: Mail Delivery Subsystem <MAILER-DAEMON@validdomain.com>
   ----- The following addresses had permanent fatal errors -----
root@bogusdomain_xxx.com
    (reason: 550 Host unknown)

   ----- Transcript of session follows -----
550 5.1.2 root@bogusdomain_xxx.com... Host unknown (Name server: bogusdomain_xxx.com: host not found)
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