Solved the problem using setting: milter_protocol<http://www.postfix.org/postconf.5.html#milter_protocol> = 2
as mentioned in: http://www.postfix.org/MILTER_README.html in 'main.cf' --Ashish Sharma From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of Sharma, Ashish Sent: Tuesday, November 24, 2009 12:36 PM To: postfix users list Subject: Milter's not working on Postfix 2.6.5 Hello, I have installed a Postfix (version 2.6.5 ) mail receiving server. I use the DKIM and SenderID+SPF milter referred from here: http://www.postfix.org/MILTER_README.html My 'main.cf' settings for above mentioned milters is as: #Milter support for smtpd mail smtpd_milters = inet:localhost:10026, inet:localhost:10027 # Milters for non-SMTP mail. non_smtpd_milters = inet:localhost:10026, inet:localhost:10027 milter_default_action = tempfail But I receive the following mailog messages whenever a mail is sent on this postfix mail server and the mail is rejected: Nov 24 01:52:16 ip-10-244-19-127 postfix/smtpd[3953]: warning: milter inet:localhost:10026: can't read SMFIC_DATA reply packet header: Success Nov 24 01:52:16 ip-10-244-19-127 postfix/smtpd[3953]: warning: milter inet:localhost:10027: can't read SMFIC_DATA reply packet header: Success As a result milter results are not appended into the mail headers. But the same milters work without a problem on Postfix (version 2.3.3) and milter headers are appended in the e-mail received. Please help so that I can use the above mentioned milters for Postfix (version 2.6.5). With regards Ashish Sharma