Yahoo suggestions

[Drew Burchett]

One of the things that I do to help the situation is to enable
smtpd_recipient_restrictions in postfix.  I have the following
restrictions set:

permit_mynetworks,
check_sender_access hash:/etc/postfix/db/senderWhitelist,
reject_unauth_destination,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unknown_sender_domain,
reject_unauth_pipelining,
reject_unverified_sender,
reject_rbl_client relays.ordb.org,
reject_rbl_client opm.blitzed.org,
reject_rbl_client list.dsbl.org,
reject_rbl_client sbl.spamhaus.org,
reject_rbl_client cbl.abuseat.org,
reject_rbl_client dul.dnsbl.sorbs.net,
reject_rhsbl_client blackhole.securitysage.com,
reject_rhsbl_sender blackhole.securitysage.com,
permit

The one that helps the most in this case is the
reject_unverified_sender, which makes sure the email account exists at
the sender's end before accepting the email.  I also use the
check_sender_access as a form of whitelist for emails from a specific
domain or user that I don't want to get caught by the other checks.  
-----Original Message-----
From: mailscanner-bounces at lists.mailscanner.info
[mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Steve
Campbell
Sent: Wednesday, March 08, 2006 7:57 AM
To: MailScanner mailing list
Subject: Yahoo suggestions

I work at a newspaper, and it seem that many vaild contributors have and
use 
yahoo accounts. After checking the logs, I find that about 99.9999999% 
emails sent from yahoo accounts are truly spam, but there is that small 
percentage that needs to get through. (Of course, these are always sent
and 
blocked on deadline, so they say)

My problem is that all of these yahoo mailings seem to be hit by the
same 
common rules like FORGED_YAHOO_RCVD and NO_REAL_NAME
and the like even though these are valid yahoo accounts. I realize that 
yahoo must be doing some non-standard manipulations, but how do others
deal 
with this other than whitelisting accounts as I get called?

My MS is a little bit old, but do the newer versions deal with this or
is 
this something that will just have to be? I certainly don't want to 
whitelist the entire yahoo.com domain!

Thanks

Steve Campbell
campbell at cnpapers.com
Charleston Newspapers


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