When Postfix reuses an SMTP connection, it may actually be reused in a different SMTP client process. This maximizes reuse and minimizes the time that a connection sits idle.
This is different from Sendmail or Exim, where a connection can be reused only in the process that creates that connection. Postfix doesn't log the "name" of a connection, so you can't how it changes hands with connection reuse (this would require logging the local TCP port number of reusable connections). > Whilst on the subject of connection caching, I assume postfix will (have > to) do a RSET between each reuse of a connection? (just a sanity check > on my part). Of course. See http://www.postfix.org/CONNECTION_CACHE_README.html Wietse
