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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.
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