I am running 9.100-16 with a home license. I do have the SMTP proxy enabled. Every hour I see 9 packets drop as shown below in Splunk:
May 17 23:15:33 192.168.1.254 2013:05:17-23:15:27 ulogd[4641]: id="2001" severity="info" sys="SecureNet" sub="packetfilter" name="Packet dropped" action="drop" fwrule="60001" initf="eth3" srcmac="0:90:1a:42:f4:f5" dstmac="0:c:29:9c:12:77" srcip="216.163.188.45" dstip="***.***.***.***" proto="6" length="40" tos="0x00" prec="0x00" ttl="56" srcport="80" dstport="54627" tcpflags="RST"
"dstip" is my external public facing IP.
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