Re: Connection cache limitations

2020-05-25 Thread Wietse Venema
Luca Fornasari: > "With Postfix versions < 3.4, the Postfix shared connection cache > cannot be used with TLS, because an open TLS connection can be reused > only in the process that creates it. For this reason, the Postfix > smtp(8) client historically always closed the connection after > completi

Connection cache limitations

2020-05-25 Thread Luca Fornasari
Scenario: I am managing a Postfix 2.10 installation acting as an hub for applications sending emails to the internet. The Postfix installation in turn uses a relayhost that is an A record resolving to n IP addresses; TLS to the relayhosts is negotiated opportunistically anyway it always succeeds.