RE: [exim] Anti Phishing Trick

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Συντάκτης: Mark Smith
Ημερομηνία:  
Προς: exim-users
Αντικείμενο: RE: [exim] Anti Phishing Trick

> -----Original Message-----
> From: exim-users-bounces@???
> [mailto:exim-users-bounces@exim.org] On Behalf Of Marc Perkel
> Sent: 24 August 2005 03:15
> To: 'Exim-users'
> Subject: [exim] Anti Phishing Trick
>
> Here's an anti phishing trick I came up with. The idea is
> that major corps will have received lines that match the
> domain in the from address. Paypal email must come from
> paypal servers. This is driven from a list of institutions to
> test. Feedback appreciated.
>


Good idea. I've been doing a similar thing with mail from Hotmail and Yahoo
for some time:


  deny
    condition   = ${if match{$sender_host_name}{\N^(.*\.)?hotmail\..+\N}}
    ! condition = ${if match{$sender_address_domain}{\N^hotmail\..+\N}}
    message     = Non-Hotmail sender address from Hotmail server.\n\
                  Please contact postmaster@$domain for further assistance.


  deny
    condition   = ${if match{$sender_address_domain}{\N^hotmail\..+\N}}
    ! condition = ${if match{$sender_host_name}{\N^(.*\.)?hotmail\..+\N}}
    ! hosts     = +relay_from_hosts
    message     = 'From' $sender_address_domain does not match 'Received'
headers.\n\
                  Please contact postmaster@$domain for further assistance.


  deny
    condition   = ${if match{$sender_address_domain}{\N^yahoo\..+\N}}
    ! condition = ${if match{$sender_host_name}{\N^(.*\.)?yahoo\..+\N}}
    ! hosts     = +relay_from_hosts
    message     = 'From' $sender_address_domain does not match 'Received'
headers.\n\
                  Please contact postmaster@$domain for further assistance.



- Mark