Ono sto mozes bez problema saznati je koji su sve MX serveri za neki domen:
C:\>dig -t mx cisco.com
;; ANSWER SECTION:
cisco.com. 86400 IN MX 20 ams-inbound-a.cisco.com.
cisco.com. 86400 IN MX 25 syd-inbound-a.cisco.com.
cisco.com. 86400 IN MX 10 sj-inbound-a.cisco.com.
cisco.com. 86400 IN MX 10 sj-inbound-b.cisco.com.
cisco.com. 86400 IN MX 10 sj-inbound-c.cisco.com.
cisco.com. 86400 IN MX 10 sj-inbound-d.cisco.com.
cisco.com. 86400 IN MX 10 sj-inbound-e.cisco.com.
cisco.com. 86400 IN MX 10 sj-inbound-f.cisco.com.
cisco.com. 86400 IN MX 15 rtp-mx-01.cisco.com.
;; ADDITIONAL SECTION:
sj-inbound-a.cisco.com. 86400 IN A 128.107.234.204
sj-inbound-b.cisco.com. 86400 IN A 128.107.234.205
sj-inbound-c.cisco.com. 86400 IN A 128.107.234.206
sj-inbound-d.cisco.com. 86400 IN A 128.107.243.13
sj-inbound-e.cisco.com. 86400 IN A 128.107.243.14
sj-inbound-f.cisco.com. 86400 IN A 128.107.234.207
rtp-mx-01.cisco.com. 86400 IN A 64.102.255.47
ams-inbound-a.cisco.com. 86400 IN A 64.103.36.153
syd-inbound-a.cisco.com. 86400 IN A 64.104.252.248
Dakle za cisco.com zaduzeno je 9 MX servera, na razlicitim lokacijama (San Jose, Raleigh, Amsterdam, Sydney), razlicitih prioriteta. Ovi koji imaju prioritet veci od 10 su verovatno u nekom load-balancing-u na osnovu lokacije klijenta, ovi sa prioritetom 10 su u round robin-u...
"99% of your thought process is protecting your self-conceptions,
and 98% of that is wrong."