Diferencia entre revisiones de «Antispam methods»

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=postgrey=
 
=postgrey=
 +
==Install==
 
  apt-get install postgrey
 
  apt-get install postgrey
 
  netstat -anp | grep 60000
 
  netstat -anp | grep 60000
 
   tcp        0      0 127.0.0.1:60000        0.0.0.0:*              LISTEN    18478/postgrey.pid
 
   tcp        0      0 127.0.0.1:60000        0.0.0.0:*              LISTEN    18478/postgrey.pid
 
   
 
   
/etc/postfix/main.cf
+
In /etc/postfix/main.cf add to "smtpd_recipient_restrictions ="
 
  check_policy_service inet:127.0.0.1:60000
 
  check_policy_service inet:127.0.0.1:60000
  
 +
Restart postfix:
 +
/etc/init.d/postfix restart
 +
 +
==Administration==
 +
Lists the automatically whitelisted servers:
 +
perl /usr/share/doc/postgrey/postgrey_clients_dump
  
 
=Blacklist=
 
=Blacklist=

Revisión del 10:21 20 nov 2006

postgrey

Install

apt-get install postgrey
netstat -anp | grep 60000
 tcp        0      0 127.0.0.1:60000         0.0.0.0:*               LISTEN     18478/postgrey.pid

In /etc/postfix/main.cf add to "smtpd_recipient_restrictions ="

check_policy_service inet:127.0.0.1:60000

Restart postfix:

/etc/init.d/postfix restart

Administration

Lists the automatically whitelisted servers:

perl /usr/share/doc/postgrey/postgrey_clients_dump

Blacklist

/etc/postfix/main.cf

reject_rbl_client sbl-xbl.spamhaus.org


TMDA

Significantly reduce the amount of spam

  • whitelists: accept mail from known, trusted senders.
  • blacklists: refuse mail from undesired senders.
  • challenge/response: allows unknown senders which aren't on the whitelist or blacklist the chance to confirm that their message is legitimate (non-spam).
  • tagged addresses: special-purpose e-mail addresses such as time-dependent addresses, or addresses which only accept certain kinds of communication. These increase the transparency of TMDA for unknown senders by allowing them to safely circumvent the challenge/response system.

This methodology has the advantage of being very selective about what it allows in, while at the same time permitting legitimate, but previously unknown senders to reach you.

References