>> lmtp_destination_concurrency_limit = 50 >> lmtp_destination_recipient_limit = 5000 >> lmtp_connection_cache_on_demand = no >> lmtp_data_done_timeout = 3600s > > Why do you set lmtp_connection_cache_on_demand = no? I had issues with the cached connections. I don't remember the specifics, just that things improved when I turned them off. It might be a mis-configuration on the number of clients versus the number of allowed servers. John -- John Madden / Sr UNIX Systems Engineer Office of Technology / Ivy Tech Community College of Indiana Free Software is a matter of liberty, not price. To understand the concept, you should think of Free as in 'free speech,' not as in 'free beer.' -- Richard Stallman ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/