It has happened many times that the emails from our server were identified as spam. I have checked the emails which were not identified as spam. But I found that the SpamAssassin Scoring For MDAEMON_DNSBL is quite high, the score of MDAEMON_DNSBL is always 4. I also checked the logs of SpamAssassin and here are some messages:
Performing DNS-BL lookup * zen.spamhaus.org - passed * bl.spamcop.net - passed * bad.psky.me - failed - 198.54.117.200 * 1.6 BAYES_50 BODY: Bayes spam probability is 40 to 60% * [score: 0.5000] * 4.0 MDAEMON_DNSBL MDaemon: marked by MDaemon\'s DNSBL * 2.1 FREEMAIL_FORGED_REPLYTO Freemail in Reply-To, but not From The email sender has set up SPF record. I still don't know what's reason for such a high score for MDAEMON_DNSBL and why FREEMAIL_FORGED_REPLYTO got 2.1 score? -- Sent from: http://spamassassin.1065346.n5.nabble.com/SpamAssassin-Users-f3.html
