Bulk mail rejections declining

Vernon Schryver vjs@calcite.rhyolite.com
Tue Feb 16 21:05:02 UTC 2010

> From: Gary Mills <mills@cc.umanitoba.ca>

> Is there a way to loosen the rejection criteria for body checksums?

If you use sendmail+dccm, you can adjust the thresholds for all of the DCC
checksums by changing DCCM_REJECT_AT in /var/dcc/dcc_conf and restarting
dccm.  The value should be a number (probably >=5), the string "MANY",
or "NEVER".

> Would it be better just to disable one of the checksums?  Which one
> would that be?

You can change the threshold for an individual checksum by adding
-tBODY,X  -tFUZ1,X  or -tFUZ2,X to DCCM_ARGS in /var/dcc/dcc_conf
where X is a number or the string MANY or NEVER.

See the dccm man page.

You can also change thresholds with these lines in /var/dcc/whiteclnt
or for an individual user with /var/dcc/.../$USER/whiteclnt
option threshold Body,X
option threshold FUZ1,X
option threshold FUZ2,X

This line in a whiteclnt file turns off DCC checks for all users
or an individual user:
option dcc-off

Changes to a whiteclnt file are noticed automatically by dccm or dccifd
_after_ the next mail message or often sooner.

The proof of concept cgi scripts in the source can be used to maintain
the global /var/dcc/whiteclnt file or individual user files.
See the demo at 
or the cgi-bin/README file in the DCC source or at

Vernon Schryver    vjs@rhyolite.com

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