* The output of a manual SMTP test (typically with telnet) from your
mail server to our servers showing the SMTP conversation leading up to
and including the rejection message.
应该是用telnet来测试吧,但是不知道telnet后要加什么,telnet进去怎么测试。
* Log messages from your mail server showing which IP you connected to
and what responses you got from the remote server at the time you
received the failures.