# dig hp.com -t mx | grep MX
;; hp.com, type = MX, class = IN
hp.com. 21m28s IN MX 50 cossmtp.hp.com.
hp.com. 21m28s IN MX 50 palsmtp.hp.com.
hp.com. 21m28s IN MX 20 postal.agilent.com.
hp.com. 21m28s IN MX 10 envelope.hp.com.
hp.com. 21m28s IN MX 10 letter.hp.com.
hp.com. 21m28s IN MX 20 stamp.agilent.com.
hp.com. 21m28s IN MX 30 cossmtpx.hp.com.
hp.com. 21m28s IN MX 50 atlsmtp.hp.com.
# telnet envelope.hp.com 25
Trying 192.151.10.4...
Connected to envelope.hp.com.
Escape character is '^]'.
220 envelope.hp.com ESMTP Postfix
QUIT
221 Bye
Connection closed by foreign host.
# telnet letter.hp.com 25
Trying 192.151.10.3...
Connected to letter.hp.com.
Escape character is '^]'.
220 letter.hp.com ESMTP Postfix
QUIT
221 Bye
Connection closed by foreign host.
# telnet postal.agilent.com 25
Trying 192.6.9.3...
Connected to postal.agilent.com.
Escape character is '^]'.
220 postal.agilent.com ESMTP Postfix
QUIT
221 Bye
Connection closed by foreign host. |