Blocking peek-through spammers

Vernon Schryver vjs@calcite.rhyolite.com
Sat May 17 13:15:08 UTC 2003


> From: Evgeniy <evgeniy@riscom.net>

> ...
> > an access_DB entry like
> >      To:designcenter@ibp.com	DCC: "REJECT expn spam"
>
> can i use this examples 
> To:oper@defender.riscom.net DCC:"IGNORE expn spam"
>
> or this 
>
> To:@defender.riscom.net DCC:"IGNORE expn spam"

Dccm recognizes only a single special word at the start of the
sendmail ${dcc_isspam} macro.  That word is "DISCARD".  If the
macro starts with "DISCARD", dccm will discard instead of reject
the message even if running as `dccm -aREJECT` or `dccm -aIGNORE`


Thus, a sendmail access_DB line like 

  To:oper@defender.riscom.net DCC:"IGNORE expn spam"

combined with a sendmail.cf set by `misc/hackmc` reject or discard
a message with an envelope recipient of "oper@defender.riscom.net"

To whitelist such mail, try 

  To:oper@defender.riscom.net OK

combined with a sendmail.cf modified by `misc/hackmc -O`

See http://www.rhyolite.com/anti-spam/dcc/dcc-tree/misc/hackmc


Vernon Schryver    vjs@rhyolite.com



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