spamd process getting silently killed - Ubuntu Server 12.04

Hi All, I'm experiencing a weird situation as the spamd process gets killed after running 2-3 days on Ubuntu 12.04 server edition. There is no sign of a failure in logs. Currently what I do is running a script to check spamd process for every 10 secs. Is it a known issue? Thanks, Rumesh

Remove spam results from mail header

[score: 0.4901] 0.8 RDNS_NONE Delivered to internal network by a host with no rDNS X-SA-Exim-Connect-IP: x.x.x.x X-SA-Exim-Mail-From: xxx X-SA-Exim-Scanned: No (on ); SAEximRunCond expanded to false -- Re@lBanda