On Thu, Feb 05, 2015 at 02:34:09PM +0100, Markus Benning wrote: > Is there a switch to enable connection logging I missed?
As Wietse pointed out, TLS connectiosn are never re-used. Non-TLS connections may be re-used, in which case, the log entry shows "conn_use=<count>" for some count >= 2. Each log entry without a "conn_use=<count>" field represents a new connection, but you need to do duplicate-elimination for multiple recipients: smtp[<pid>]: <queueid>: to=<...>, ... (<server reply>) entries with the same <pid>, <queueid> and <server reply> are almost certainly a single "envelope" (especially if the next hop server includes a unique queue-id in its reply). -- Viktor.