I should be able to figure this out, but I must be missing something.. I uninstalled Trend Micro and somehow in the process it wiped out some settings in my receive connectors. The main symptom was that although Exchange email continued to flow, a few people who get their email via POP who are outside the network could no longer send or receive email. I was able to fix that, but in the process they could no longer send mail if they had their client configured to require authentication. At this point I am not sure what settings each of the connectors should have for Authentication and Permission Groups. I need to be able to send/receive mail to and from the internet, send/receive mail from a fax device within the network, and I need my POP clients to be able to send/receive email without an open relay. I know this is simple, and I'm probably overthinking it, but it's driving me nuts!