DNS query to find mail servers
To find which servers handle mail for a particular domain use dig:
# dig google.com MX
;; QUESTION SECTION: ;google.com. IN MX ;; ANSWER SECTION: google.com. 561 IN MX 100 google.com.s9a1.psmtp.com. google.com. 561 IN MX 100 google.com.s9a2.psmtp.com. google.com. 561 IN MX 10 smtp1.google.com. google.com. 561 IN MX 10 smtp2.google.com. google.com. 561 IN MX 10 smtp3.google.com. google.com. 561 IN MX 10 smtp4.google.com.
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