Pflogsumm emails through amavisd and SA hitting BAYES_99

[Simon Wilson]

----- Message from Dominic Raferd <dominic at timedicer.co.uk> ---------
    Date: Fri, 28 Apr 2017 11:55:03 +0100
    From: Dominic Raferd <dominic at timedicer.co.uk>
Subject: Re: Pflogsumm emails through amavisd and SA hitting BAYES_99
      To: amavis-users at amavis.org


> On 28 April 2017 at 11:34, Simon Wilson <simon at simonandkate.net> wrote:
>
>> Hi all,
>>
>> I have pflogsumm running log summaries on my postfix install, and sending
>> to an address that resolves locally. All is on localhost, which is a newly
>> installed CentOS7 server, amavisd-new 2.10.1 from EPEL.
>>
>> The pflogsumm emails from root are triggering BAYES_99 as they go through
>> amavisd-new and spamassassin, and are often ending up marked as spam.
>>
>> What's the best way to ensure that those are not flagged as spam, or
>> potentially to whitelist them somehow?
>
>
> You can whitelist sender addresses, would this solve your problem? I have
> these lines in /etc/amavis/conf.d/50-user​:
>
> read_hash(\%whitelist_sender, '/etc/amavis/whitelist');
> @whitelist_sender_maps = (\%whitelist_sender);
>     bypass_spam_checks_maps   => ['@whitelist_sender_maps'],  # don't
> spam-check this mail
>     bypass_banned_checks_maps => ['@whitelist_sender_maps'],  # don't
> banned-check this mail
>     bypass_header_checks_maps => ['@whitelist_sender_maps'],  # don't
> header-check this mail
>
> File /etc/amavis/whitelist contains a line-by-line list of whitelisted
> addresses. To whitelist a whole domain, just precede with a dot. Examples:
>
> fred at bloggs.com
> .spammers-united.com
>
> HTH, Dominic


----- End message from Dominic Raferd <dominic at timedicer.co.uk> -----

Thanks Dominic... it seems like a bit of a 'sledgehammer' to whitelist  
a sender address, when sender addresses can be spoofed. Perhaps I'm  
being paranoid :) Keen to hear feedback on that (the approach, not  
whether I am paranoid :) ).

One thing I just noticed is that pflogsumm emails are dropped into  
Postfix (and thence into Amavisd) via postfix/pickup not  
postfix/smtpd. I wonder if there is a way there to mark emails from  
localhost root that are fed into postfix/pickup as being not  
spam-checked.

Simon.


-- 
Simon Wilson
M: 0400 12 11 16