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[sendmail] One Spam Per Day..

 
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Old 03-09-2015
[sendmail] One Spam Per Day..
Hi,
I have sendmail 8.14.4 on a CentOS 6.6-RELEASE virtual machine. This box is primary MX for our domain, and everything is swell.

Every single day, one spam gets through. This spam has the 'From' address '<>', and my google search reveals that blocking the null sender is not a good idea.

In my sendmail.mc, I have:

dnl FEATURE(`enhdnsbl',`sbl-xbl.spamhaus.org',`"Message from "$&{client_addr}" rejected - see: http://www.spamhaus.org/sbl"

But this blocks e-mail from two of our clients.

One spam per day isn't that bad, but it's frustrating that I can't stop it. The IP is different every day. The e-mail always comes from 'david[randomcharacters]@something.com, so I can't block 'david,' because that will stop legitimate e-mails.

I think that this is a job for procmail, but reading the recipes, they look like they were written in postgrad maths.

Can someone help?
 
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LEARN ABOUT DEBIAN

sensible-mda

SENSIBLE-MDA(8) 					      System Manager's Manual						   SENSIBLE-MDA(8)

NAME

       sensible-mda - a generic local MDA router for Debian systems

SYNOPSIS

       sensible-mda from to detail client-addr

DESCRIPTION

       sensible-mda  is used to simplify the installation and configuration of sendmail(8) , or other MTAs for use on Debian systems.  With sensi-
       ble-mda, sendmail can support a plethora of MDAs (procmail, maildrop, deliver, etc.) without having  pick any one of them as required.

FUNCTION

       sensible-mda is called by sendmail as a local mailer when the following exists in sendmail.mc:
       define(`LOCAL_MAILER_ARGS', `sensible-mda $g $u $h ${client_addr}')dnl

       sensible-mda will look for the following MDAs (in this order), and pass the mail on to the first SUID MDA found (Or first found MDA, if run
       w/euid=root): procmail(1), maildrop(1), deliver(8), mail.local(8)

OPTIONS

       Available command line options are the following:

       from   The sender of this email (sendmail $g variable)

       to     The recipient of this email (sendmail $u variable)

       detail The detail portion of the recipient userid (sendmail $h variable) - ie:
	      cowboy+sendmail@debian.org

       client-addr
	      TCP/IP address of the sender (sendmail ${client_addr} variable) Not used (for the nonce)

FILES

       /etc/mail/sendmail.mc
	      sendmail m4 input to generate sendmail.cf

       /etc/mail/sendmail.cf
	      actual sendmail configuration file (treated as a binary file)

SEE ALSO

       sendmail(8), procmail(1), maildrop(1), deliver(8), mail.local(8)

BUGS

       None known so far.

AUTHOR

       Richard Nelson <cowboy@debian.org>

HISTORY

4th Berkeley Distribution					  October 21 1999						   SENSIBLE-MDA(8)