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keeps the zombies away, more smtpd(8) processes remain available
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for legitimate clients. </p>
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<p> The postscreen(8) server is available with Postfix 2.8 and
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later. To keep the implementation simple, postscreen(8) delegates
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delegates TLS encryption/decryption to tlsproxy(8) server processes.
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This delegation is invisible to the remote SMTP client, and is not
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shown in the diagram below. </p>