/etc/mail/m4/clamav-milter.m4 is in clamav-milter 0.100.0+dfsg-0+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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dnl clamav-milter.m4
dnl
dnl configure sendmail to use clamav-milter
dnl
dnl written by Elrond <elrond@samba-tng.org> 2004
dnl
dnl
INPUT_MAIL_FILTER(`clamav', `S=local:/var/run/clamav/clamav-milter.ctl, F=, T=S:4m;R:4m')dnl
dnl
dnl INPUT_MAIL_FILTER usually already does the right thing
dnl to confINPUT_MAIL_FILTERS, but to be sure, we do it
dnl again, if necessary.
dnl
dnl if confINPUT_MAIL_FILTERS set:
dnl if it contains clamav
dnl do nothing
dnl else
dnl append ", clamav"
dnl else
dnl set it to "clamav"
dnl
ifdef(`confINPUT_MAIL_FILTERS',
`ifelse(regexp(`,'defn(`confINPUT_MAIL_FILTERS')`,', `, *clamav *,'),
`-1',
`define(`confINPUT_MAIL_FILTERS',
defn(`confINPUT_MAIL_FILTERS')`, clamav')')',
`define(`confINPUT_MAIL_FILTERS', `clamav')')dnl
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