Re: LYNX-DEV lynx-dev list status/problems

[Mike Brown]

If you are running a current version of Sendmail, you can have your system
deny incoming mail based on domain or sender. We use Sendmail 8.8.5 and have
these lines in our /etc/sendmail.cf:

F{SpamDomains} /usr/local/etc/mail/spamdomains
F{Spammer} /usr/local/etc/mail/spammers


and then in the rewrite rules, down below the Ruleset 98 section is this:

Scheck_mail
R<$={Spammer}>                  $#error $@ 5.7.1 $: "571 We don't accept junk 
mail"
R$*                             $: $>3 $1
R$*<@$*$={SpamDomains}.>$*      $#error $@ 5.7.1 $: "571 We don't accept junk 
mail from your domain"
R$*<@$*$={SpamDomains}>$*       $#error $@ 5.7.1 $: "571 We don't accept junk 
mail from your domain"
R$={Spammer}                    $#error $@ 5.7.1 $: "571 We don't accept junk 
mail"
R$*                             $: <?> $>3 $1
R<?> $* < @ $+ . >              $: <OK>
R<?> $* < @ $+ >                $#error $@ 5.7.1 $: "571 Domain must resolve - 
check your DNS"


Sorry for the long lines.

The file /usr/local/etc/mail/spamdomains is a list of domains to block, one
per line (our list is nearly 500 domains long now), and the spammers file is
a list of email addresses to block, for those situations where you don't want
to block mail from the entire domain.

WARNING: If you don't know what you're doing, don't mess with your sendmail.cf.
I'm only providing this for informational purposes.

Mike
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