[syslog-ng] duplicated log lines

FreeBSD sl1.hctc.net 8.2-RELEASE syslog-ng 2.0.10 I filter the mail flow into per-mail-sever files. I start with the FreeBSD syslog-ng.conf which emulates the system syslog.conf and add my stuff. The problem is that all maillog files have duplicate lines. After modifying a bunch of stuff, no success. Either I get no maillog traffic at all, or the dupes remain. How to debug? thanks Len