============ Required information ====
- iRedMail version: iRedMail-0.9.0
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Apache
- Linux/BSD distribution name and version: Ubuntu 14.04
- Related log if you're reporting an issue:
====

Hi All,

I have had my new server with iRedMail 0.9.0 running for about 2 months now.  Initially I was thrilled with how much better it was working vs. my home grown install, especially when it comes to detecting spam effectively.  About two weeks ago though I experienced a sudden drop in spam detection.  I updated my configuration to add spam headers to all mails and I can see that they are still being marked but are just scoring very low.  Previously ~ 65% of my emails to two accounts were correctly identified as spam.  That number has now fallen to < 10% and you can see from the attached graph that the drop was sudden on 5/30.

I have not altered the default spam settings other than to force headers in all mails.  Recent undetected spam headers look like this:

--
X-Spam-Flag: NO
X-Spam-Score: 0.294
X-Spam-Level:
X-Spam-Status: No, score=0.294 tagged_above=-9999 required=6.31
    tests=[BAYES_05=-0.5, HTML_MESSAGE=0.001, RDNS_NONE=0.793]
    autolearn=no autolearn_force=no
--

--
X-Spam-Flag: NO
X-Spam-Score: 3.737
X-Spam-Level: ***
X-Spam-Status: No, score=3.737 tagged_above=-9999 required=6.31
    tests=[BAYES_60=1.5, DKIM_SIGNED=0.1, HTML_IMAGE_RATIO_06=0.001,
    HTML_MESSAGE=0.001, MIME_HTML_ONLY=0.723, MISSING_MID=0.497,
    RDNS_NONE=0.793, SPF_HELO_NEUTRAL=0.112, T_DKIM_INVALID=0.01]
    autolearn=no autolearn_force=no
--

And from one that was successfully matched today:

--
X-Spam-Flag: YES
X-Spam-Score: 7.141
X-Spam-Level: *******
X-Spam-Status: Yes, score=7.141 tagged_above=-9999 required=6.31
    tests=[AC_SPAMMY_URI_PATTERNS10=2.353, BAYES_50=0.8,
    HTML_FONT_LOW_CONTRAST=0.001, HTML_MESSAGE=0.001, HTML_OFF_PAGE=1,
    RDNS_NONE=0.793, THIS_AD=2.183, T_REMOTE_IMAGE=0.01]
    autolearn=no autolearn_force=no
--

I'm not sure what steps to take to identify why this change has occurred and appreciate any pointers.  Would like to get the effectiveness of the spam filtering back to where it was!

Thanks,
~ Bill