Reject emails to nonexistent addresses?

[Fractal IT Dept.]

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Hi everyone,

We're getting tons of spam directed at addresses that neither exist, nor
ever exist. I'm not sure of the spammers' motivation here...are they
hoping to simply spam the "catch-all" account, if it exists? Is there an
easy way of somehow rejecting emails destined to nonexistent addresses
before they are processed by MailScanner?

We're running Fedora Linux, Sendmail, Procmail, and of course
MailScanner.

Cheers,
Chris
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