1Qmail needs 54 seconds to relay 100 messages with one recipient. 2Default configuration, concurrencyremote = 100. 3 4spike_4% /usr/bin/time ./smtp-source -s 5 -m 100 fist 5 43.77 real 0.05 user 0.23 sys 6Jun 8 12:08:36 fist qmail: 865786116.744366 new msg 39901 7Jun 8 12:09:32 fist qmail: 865786172.791473 end msg 39921 8Total time: 56 sec 9 10/usr/bin/time ./smtp-source -s 10 -m 100 fist 11 26.66 real 0.06 user 0.26 sys 12Jun 8 12:06:20 fist qmail: 865785980.185885 new msg 39901 13Jun 8 12:07:14 fist qmail: 865786034.306429 end msg 39920 14Total time: 54 sec 15 16spike_8% /usr/bin/time ./smtp-source -s 20 -m 100 fist 17 20.94 real 0.11 user 0.27 sys 18Jun 8 12:10:52 fist qmail: 865786252.412648 new msg 39901 19Jun 8 12:11:46 fist qmail: 865786306.080605 end msg 39962 20Total time: 54 sec 21