On Thu, 29 Apr 2004, Nicole wrote:

Seems like its trying to show web data.. and it ignores errors. I am seeing a bit of these. Nothing googelable for SHWAN-PROXY =[

Some broken script or worm?

It's most likely an HTTP proxy connection abuse. Since CONNECT proxies are drying up, people are using open HTTP proxies to try to send mail. Basically they send a POST to the proxy that causes it to connect to your server, and make an HTTP request that contains SMTP commands, so after the HTTP commands it would have a line like: value=\r\nHELO sdfads\r\nMAIL FROM:<Ima@spammer.com>\r\nRCPT TO:<sucker@spammed.com>\r\nDATA\r\nSee my website\r\n\. which if your mail server ignores the errors caused by the HTTP header will cause an SMTP session to be triggered. I'm not sure if postfix has it, but setting a max number of errors per session, or making sure the SMTP lock-step is followed can really help stop these. -S

Nicole

Transcript of session follows.

Out: 220 krell.webweaver.net ESMTP commodore 64 Postfix Baby In: POST / HTTP/1.0 Out: 502 Error: command not implemented In: Via: 1.0 SHWAN-PROXY Out: 502 Error: command not implemented In: Host: mail.webweaver.net:25 Out: 502 Error: command not implemented In: Content-Length: 1056 Out: 502 Error: command not implemented In: Content-Type: text/plain Out: 502 Error: command not implemented In: Connection: Keep-Alive Out: 502 Error: command not implemented In: Out: 500 Error: bad syntax In: RSET Out: 250 Ok In: HELO webtv.net Out: 250 krell.webweaver.net In: MAIL FROM:<swe4etp07@hotmail.com> Out: 250 Ok In: RCPT TO:<nicole@webweaver.net> Out: 550 Client host rejected: cannot find your hostname, [207.68.98.5] In: DATA Out: 554 Error: no valid recipients In: To: <nicole@webweaver.net> Out: 502 Error: command not implemented In: From: "roman" <jojo21planet@hotmail.com> Out: 221 Error: I can break rules, too. Goodbye.

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