interesting SMTP issue /w Windows + Telnet
in [Postfix]
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From: "Michael Northcott" on 8 Jun 2010 10:51 Hello all, I've got a dilly of a pickle for you. Running postfix-2.5.6-1.fc9.i386 on Fedora 9. I do a simple telnet session on one windows computer and it works, I do the exact same thing on the other windows computer and it does not work. Both run Windows XP SP3 updated to latest as of 2010-06-07 (YMD), both have a fairly simple setup and are only using English (Canada) as language, English (Canada) - US keyboard, very few programs installed, yet something is clearly different between them. Here is my telnet session (as I am internal I can use whatever HELO I find amusing at the time): 220 mail.<OBSCURED>.ca ESMTP Postfix helo melo.yelo.jelo 250 mail.<OBSCURED>.ca mail from:michaeln@<OBSCURED>.ca 250 2.1.0 Ok rcpt to:michaeln@<OBSCURED>.ca 250 2.1.5 Ok data 354 Start mail input; end with <CRLF>.<CRLF> Subject: hi hi .. 221 2.7.0 Error: I can break rules, too. Goodbye. Connection to host lost. Here are the corresponding log entries, with that system added to debug_peer_list: Jun 7 13:59:17 mail postfix/smtpd[25587]: connect from unknown[192.168.6.9] Jun 7 13:59:17 mail postfix/smtpd[25587]: match_hostaddr: 192.168.6.9 ~? <OBSCURED> Jun 7 13:59:17 mail postfix/smtpd[25587]: match_hostaddr: 192.168.6.9 ~? 192.168.6.0/24 Jun 7 13:59:17 mail postfix/smtpd[25587]: > unknown[192.168.6.9]: 220 mail.<OBSCURED>.ca ESMTP Postfix Jun 7 13:59:21 mail postfix/smtpd[25587]: < unknown[192.168.6.9]: helo melo.yelo.jelo Jun 7 13:59:21 mail postfix/smtpd[25587]: > unknown[192.168.6.9]: 250 mail.<OBSCURED>.ca Jun 7 13:59:32 mail postfix/smtpd[25587]: < unknown[192.168.6.9]: mail from:michaeln@<OBSCURED>.ca Jun 7 13:59:32 mail postfix/smtpd[25587]: > unknown[192.168.6.9]: 250 2.1.0 Ok Jun 7 13:59:40 mail postfix/smtpd[25587]: < unknown[192.168.6.9]: rcpt to:michaeln@<OBSCURED>.ca Jun 7 13:59:40 mail postfix/smtpd[25587]: permit_mynetworks: unknown 192.168.6.9 Jun 7 13:59:40 mail postfix/smtpd[25587]: match_hostaddr: 192.168.6.9 ~? <OBSCURED> Jun 7 13:59:40 mail postfix/smtpd[25587]: match_hostaddr: 192.168.6.9 ~? 192.168.6.0/24 Jun 7 13:59:40 mail postfix/smtpd[25587]: permit_mynetworks: unknown 192.168.6.9 Jun 7 13:59:40 mail postfix/smtpd[25587]: match_hostaddr: 192.168.6.9 ~? <OBSCURED> Jun 7 13:59:40 mail postfix/smtpd[25587]: match_hostaddr: 192.168.6.9 ~? 192.168.6.0/24 Jun 7 13:59:40 mail postfix/smtpd[25587]: permit_inet_interfaces: unknown 192.168.6.9 Jun 7 13:59:40 mail postfix/smtpd[25587]: C91D324059: client=unknown[192.168.6.9] Jun 7 13:59:40 mail postfix/smtpd[25587]: > unknown[192.168.6.9]: 250 2.1.5 Ok Jun 7 13:59:49 mail postfix/smtpd[25587]: < unknown[192.168.6.9]: dataDATA Jun 7 13:59:49 mail postfix/smtpd[25587]: > unknown[192.168.6.9]: 502 5.5.2 Error: command not recognized Jun 7 13:59:49 mail postfix/smtpd[25587]: < unknown[192.168.6.9]: Subject: hi Jun 7 13:59:49 mail postfix/smtpd[25587]: warning: non-SMTP command from unknown[192.168.6.9]: Subject: hi Jun 7 13:59:49 mail postfix/smtpd[25587]: > unknown[192.168.6.9]: 221 2.7.0 Error: I can break rules, too. Goodbye. Jun 7 13:59:49 mail postfix/smtpd[25587]: match_hostaddr: 192.168.6.9 ~? <OBSCURED> Jun 7 13:59:49 mail postfix/smtpd[25587]: match_hostaddr: 192.168.6.9 ~? 192.168.6.0/24 Jun 7 13:59:49 mail postfix/smtpd[25587]: disconnect from unknown[192.168.6.9] Note that what it seems to be doing is appending an extra "DATA" to my "data" line, and I end up with "dataDATA". If I try capitalizing everything I end up with that line saying "DATADATA". I've never seen anything like this before. I tried pasting the lines one at a time via remote desktop, I tried typing them in, I tried the universal problem solver on XP of restarting the computer, no luck. This system works fine in every other way that I can tell, it just for some reason cannot do a proper telnet to our mailserver it seems. I also tried entering DATA and hitting enter 3 times, and the log shows one line of "DATADATA" and does not log the other two attempts, even though each time the server responds with "354 Start mail input; end with <CRLF>.<CRLF>". Google does not seem to know about this issue at all. Though I realize the problem is probably mostly due to windows, there's got to be a way to solve this, a better way to debug this, whatever. Ontop of that, if it is possible to happen to me, it could very well happen to someone else. If I have to, I will format this system completely to resolve the issue, but the fact that it was possible to occur strikes me as a problem. If the issue is found to be interesting enough, I can offer remote desktop and ssh access, but obviously only to someone trustworthy. Thanks, Mike
From: Wietse Venema on 8 Jun 2010 11:31 Michael Northcott: > 354 Start mail input; end with <CRLF>.<CRLF> That is not Postfix. Perhaps you are talking to some antivirus software. The Postfix response is: "354 End data with <CR><LF>.<CR><LF>". Wietse
From: "Michael Northcott" on 8 Jun 2010 12:16 Aha! Thanks, that explains a lot. I thought I turned off the mail filtering but I guess not. So this "security" program must be mangling all SMTP sessions that do not look like Outlook - what a great "solution". This seems consistent with the overall poor quality of the rest of the security suite. (Disclosure: program involved is Trend Micro Internet Security 2010) Thanks, Mike -----Original Message----- From: owner-postfix-users(a)postfix.org [mailto:owner-postfix-users(a)postfix.org] On Behalf Of Wietse Venema Sent: Tuesday, June 08, 2010 9:32 AM To: Postfix users Subject: Re: interesting SMTP issue /w Windows + Telnet Michael Northcott: > 354 Start mail input; end with <CRLF>.<CRLF> That is not Postfix. Perhaps you are talking to some antivirus software. The Postfix response is: "354 End data with <CR><LF>.<CR><LF>". Wietse
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