db:/#  tcptraceroute mx1.hotmail.com 25
Tracing the path to mx1.hotmail.com (64.4.50.50) on TCP port 25 (smtp), 30 hops max
 1  fw.infometrics.co.nz (210.48.109.90)  0.326 ms  0.450 ms  0.399 ms
 2  iconz-pt.wix.net.nz (202.7.1.5)  1.145 ms  1.030 ms  1.030 ms
 3  f0-0.hsrp1.core1.wlg.iconz.net.nz (210.48.3.254)  1.675 ms  1.517 ms  1.275 ms
 4  fe-0-0-1.air01-jcore.iconz.net (210.48.5.17)  13.275 ms  12.970 ms  12.818 ms
 5  fe-3-48.cat01-air.iconz.net (210.48.5.26)  13.458 ms  12.498 ms  14.063 ms
 6  vl17.cat02-air.iconz.net (210.48.17.252)  18.078 ms  13.705 ms  13.530 ms
 7  fe-0-0.sl-br-air.iconz.net (210.48.5.45)  14.204 ms  15.224 ms  17.059 ms
 8  sl-gw1-auk-6-0-1.sprintlink.net (203.222.35.197)  13.834 ms  13.724 ms  14.315 ms
 9  sl-bb21-syd-1-1.sprintlink.net (203.222.33.22)  38.071 ms  37.748 ms  40.794 ms
10  sl-bb21-syd-15-1.sprintlink.net (203.222.32.34)  38.549 ms  38.178 ms  41.251 ms
11  sl-bb21-sj-3-2.sprintlink.net (144.232.8.130)  187.159 ms  187.726 ms  188.408 ms
12  sl-st20-sj-13-0.sprintlink.net (144.232.9.58)  187.783 ms  189.071 ms  188.404 ms
13  * * *
14  * * *
15  * * *