Statistics for Parallels Premium Outgoing Antispam (OA) are incorrect or not empty.
Check if maillog has OA activity records using instructions in KB article #115257. If OA activity is present in maillog but statistics are displayed empty or incorrectly, try provided resolution.
1) Make a copy of a script:
# cp /opt/ctch/ctoblogs.php /opt/ctch/ctoblogs.php.orig
2) Perform Plesk daily statistics calculation to empty maillog:
# /opt/psa/bin/sw-engine-pleskrun /opt/psa/admin/plib/DailyMaintainance/script.php
3) Edit file
/opt/ctch/ctoblogs.php with your preferred editor. Locate string:
4) Check the difference between modified and original files:
# diff -u /opt/ctch/ctoblogs.php.orig /opt/ctch/ctoblogs.php
--- /opt/ctch/ctoblogs.php.orig 2013-03-07 18:50:10.611244001 +0700
+++ /opt/ctch/ctoblogs.php 2013-03-07 18:53:27.051244001 +0700
@@ -221,7 +221,7 @@
5) Wait for few hours (more than 2) and compare the stats showed in the Plesk with the manually counted (see KB article #115257). If manually counted stats significantly greater than the Plesk shows - contact Parallels Support.