How to block delivery of MAILER-DAEMON (<>) messages?

[Mike]

    [ The following text is in the "iso-8859-15" character set. ]
    [ Your display is set for the "US-ASCII" character set.  ]
    [ Some characters may be displayed incorrectly. ]

>From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
>Behalf Of Andreas Piper
>
>Hello all,
>
>On my MailScanner-host I am getting a lot of messages from external sites,
>which contain non-delivery notifications for spam-messages originally sent
>using faked from-adresses from our domain. As I have set 'Allow Partial
>Messages = no' and these messages contain 'Content-Type: message/partial',
>they are cleaned by MailScanner. As I have further set 'Deliver Cleaned
>Messages = yes', they are delivered to the (faked) recipients.
>
>How can I solve this problem?

Use SPF (see http://spf.pobox.com) and make sure that ALL outgoing e-mail is SRS signed (see same website). I'm using the sendmail perl script with the "-S" option, which checks the recipient of a message which has a "MAIL FROM: <>". If the recipient is postmaster or abuse, accept the message. If the recipient is someone else, only accept the e-mail when the recipient is SRS signed AND is signed by your mailserver (i.e. your MTA can translate the SRS signed recipient into it's unsigned form).

>Thanks,  Andreas

Mike.

------------------------ MailScanner list ------------------------
To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
'leave mailscanner' in the body of the email.
Before posting, read the MAQ (http://www.mailscanner.biz/maq/) and
the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).

Support MailScanner development - buy the book off the website!