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root@test-desktop:/home/test# telnet smtp.126.com 25
Trying 123.125.50.112...
Connected to smtp.126.gslb.netease.com.
Escape character is '^]'.
220 126.com Anti-spam GT for Coremail System (126com[20101010])
HELO qq.com
250 OK
MAIL FROM:<321@qq.com>
553 Requested action not taken: Local user only,smtp6,j9KowLAb4QMkY_hNJx_SAA--.53S2 1308123964
root@test-desktop:/home/test# telnet smtp.126.com 25
Trying 123.125.50.112...
Connected to smtp.126.com.
Escape character is '^]'.
220 126.com Anti-spam GT for Coremail System (126com[20101010])
HELO 126.com
250 OK
MAIL FROM:<jieao111@126.com>
553 authentication is required,smtp6,j9KowLALx4W_Y_hNdirSAA--.1845S2 1308124116