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Postfix Documentation
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Connection cache limitations

Postfix SMTP connection caching conflicts with certain applications:

  • The Postfix shared connection cache cannot be used with TLS, because saved TLS session information can be used only when a new connection is created (this limitation does not exist in connection caching implementations that reuse a connection only in the process that creates it). For this reason, the Postfix smtp(8) client always closes the connection after completing an attempt to deliver mail over TLS.

  • Postfix connection caching currently does not support multiple SASL accounts per mail server. Specifically, Postfix connection caching assumes that a SASL credential is valid for all hostnames or domain names that deliver via the same mail server IP address and TCP port, and assume that the SASL credential does not depend on the message originator.

Postfix Documentation
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