As a temporary measure until we can get a proper solution to SMTP dictionary attacks, I'm looking at using our border router (a Cisco 1605) to block SMTP from hosts attacking our SMTP. The following is what it reports for memory: 8192K bytes of DRAM onboard 4096K bytes of processor board PCMCIA flash (Read/Write) How many access-list entries can I reasonably put on the outside (ethernet0) interface, and what is the best way to dynamically update the access list in question (I'm looking at updates every four or five minutes).