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25.5 Rules Check Header Contents | 1135
prevent sendmail from stripping RFC2822 parenthetical comments from each
header??™s value.
Consider a site that sends email only to mailing lists. On such a site, it is desirable to
prevent mail that is considered spam from going out. One way to do this is to reject
all mail that contains addresses that are in either Cc: or Bcc: headers (good addresses
should only be in To: headers). Such a site might have an mc file that contains the
following:
LOCAL_CONFIG
C{BannedRecipientHeaders} Cc Bcc
H*: $>CheckBanned
LOCAL_RULESETS
SCheckBanned
R $* $: $&{hdr_name}
R $={BannedRecipientHeaders} $#error $@ 5.7.0 $: "553 Banned recipient header"
The LOCAL_CONFIG part of this mc file contains two configuration commands.
The first declares a class called BannedRecipientHeaders and assigns to that class a list
of header names that should be banned, those being the Cc: or Bcc: headers with the
colon removed.
The second configuration command starts with the wildcard form of the H configuration
command. The * in place of a header??™s name causes all headers, other than those
that have their own H configuration commands, to be screened by the CheckBanned
rule set.
The LOCAL_RULESETS part of this mc file contains a single rule set, the
CheckBanned rule set, which contains two rules.
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