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Postfix Documentation
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How do I block backscatter mail to random recipient addresses?

If your machine receives backscatter mail to random addresses, configure Postfix to reject all mail for non-existent recipients as described in the LOCAL_RECIPIENT_README and STANDARD_CONFIGURATION_README documentation.

If your machine runs Postfix 2.0 and earlier, disable the "pause before reject" feature in the SMTP server. If your system is under stress then it should not waste time.

    # Not needed with Postfix 2.1 and later.
smtpd_error_sleep_time = 0
Postfix Documentation
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