[link|http://www.merit.edu/mail.archives/nanog/msg13664.html|Nanog discussion post].

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The response sequence is fixed.

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\r\n$ telnet akdjflasdf.com 25\r\nTrying 64.94.110.11...\r\nConnected to akdjflasdf.com.\r\nEscape character is '^]'.\r\n220 snubby4-wceast Snubby Mail Rejector Daemon v1.3 ready\r\nsdfg\r\n250 OK\r\nsdfgsdfgsdfgsdf\r\n250 OK\r\nsdfgdfgaegqaergqaergvav\r\n550 User domain does not exist.\r\nasdfgasdfgasdf\r\n250 OK\r\nsdfasdfadsfasdf\r\n221 snubby4-wceast Snubby Mail Rejector Daemon v1.3 closing transmission channel\r\nConnection closed by foreign host.\r\n
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