Revision 1 as of 2018-11-22 15:44:33

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The Postfix postscreen server provides additional protection against mail server overload. One postscreen process handles multiple inbound SMTP connections, and decides which clients may talk to a Postfix SMTP server process. By keeping spambots away, postscreen leaves more SMTP server processes available for legitimate clients, and delays the onset of server overload conditions.

Postscreen is part of postfix since 20th January 2011 (since version 2.8.0) and has been productive on our mailserver since 22th June 2011.