🚀 go-pugleaf

Richard A. Muirden (richard@bofh.its.rmit.EDU.AU) wrote:

: So anyone have a fudged sendmail rulset we can all insert in our
: sendmail.cf's? I got sick and tired of them ages ago - they were using our
: machine to bounce their crap throughout humanity. I did a filter block on
: their subnet which worked to a degree, but the old MX problem continues.

In sendmail.cf (AFAIK for almost any version 8.x.y) ..

i) define a new class, in this case 'R' for 'reject', to be read from a file:

 [ .. ]

##################
#   local info   #
##################

Cwlocalhost
# file containing names of hosts for which we receive email
Fw/etc/sendmail.cw

# file containing host/domain names we ignore
FR/etc/reject-mail

 [ .. ]

ii) Add to the user-configurable part of ruleset zero ..

 [ .. ]

###################################################################
###  Ruleset 98 -- local part of ruleset zero (can be null)	###
###################################################################

S98

R$+ < @ $=R . >		$#error $@ 5.1.4 $: "We dont accept junk mail, go away"

 [ .. ]

Note that the whitespace (to '$#') here _must_ a tab.

iii) Create a file (in my case /etc/reject-mail) containing those
hosts/domains you don't want in the same format as sendmail.cw .. one or
more entries per line separated by whitespace will do it.

iv) restart the sendmail daemon.

NOTE: this will prevent not only the receipt of mail from the 'offending'
domain but also the delivery of your mail to them (which I don't consider to
be a huge loss :-)). It also doesn't care who tries to deliver it to you -
the result is the same - it bounces.

Ruleset 98, by virtue of having all the sendmail macros available, can be
used for other more complex matching - another useful rule might, for
example, be ..

Rsftcell < @ $+ >		$#error $@ 5.1.4 $: "We dont accept junk mail, go away"

 .. which bounces any mail from or to 'sftcell@any.domain.you.like',

Hope this helps,

	michael