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Kevin Blackwell said the following on 14/02/2013 20:31:
> I'm using postfix to relay email to our exchange server.
>
> The problem I'm running into is the spam filtering on the exchange filter
> is being bypassed because the relayed email shows a from address of the
> email relay server and not the originating ip address.
>
> Is there a was to configure postfix to relay male but retain the received
> from IP address when it was received by postfix?
As Reindl Harald pointed out, the spam filter should be in only one place: the
border server.
If you add something like (che the documentation before adding this parameters)
reject_invalid_hostname
reject_non_fqdn_hostname
reject_non_fqdn_sender
reject_non_fqdn_recipient
reject_unknown_sender_domain
reject_rbl_client cbl.abuseat.org
reject_rbl_client sbl.spamhaus.org
reject_rbl_client pbl.spamhaus.org
to smtpd_recipient_restrictions you block nearly 90% of spam
My advice is to disable antispam on Exchange _and_ Outlook (if you have any)
and filter in just one point.
This is useful also if you want to debug the filter, i.e. if a user asks why a
mail has been rejected.
Of course smtpd_recipient_restrictions alone is not an antispam filter, you
should also add at least an antivirus scanner.
Ciao,
luigi
- --
/
+--[Luigi Rosa]--
\
Talk is cheap because supply exceeds demand.
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