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From: Kouhei Sutou on 20 Mar 2010 00:46 Hi, Postfix 2.7.0 supports milter protocol 2, 3, 4 and 6. Postfix with milter_protocol=6 accepts a connection from a milter that uses milter protocol 2. But its milter session is broken because Postfix sends SMFIC_DATA event to the milter. In milter protocol 2, SMFIC_DATA isn't supported. So the connected milter can't reply SMFIC_DATA request. Postfix logs the following warning message on the case: Mar 20 10:25:09 mail postfix/smtpd[70678]: warning: milter inet:localhost:20025: can't read SMFIC_DATA reply packet header: Unknown error: 0 Here is a work flow on the case: SMTP Postfix milter (protocol 6) (protocol 2) telnet localhost smtp --> negotiate --> (protocol 6) <-- negotiate reply (protocol 2) accept connect --> <-- connect reply <-- 220 EHLO --> helo --> <-- helo reply <-- 250 MAIL FROM --> mail --> <-- mail reply <-- 250 RCPT TO --> rcpt --> <-- rcpt reply <-- 250 DATA --> data --> UNKNOWN REQUEST close connection can't read SMFIC_DATA reply packet header: Unknown error: 0 I'll attach a patch to fix it. Postfix doesn't send any SMFIC_DATA to protocol 2 milter with the patch. Thanks, -- kou |