Hello All, I've had very mixed results, using ISA 2000 with Macs behind the firewall. A problem I am having presently, is our Mac clients (using POP3) in regards to retrieving their e-mail. They can retrieve their e-mail - BUT they are not able to SEND mail - and they have SMTP authentication turned on (because it's required by their ISP). I am not sure if the SMTP auth is adding another level of complexity to the situation - but turning it off is not an option. Are there any tidbits of information you can throw my way, or any articles that will explain all of the ins and outs of running Macs in a ISA 2000 environment? I know there are no ISA Software Clients for the Macs (which is really unfortunate) - and they are forced to run as a Secure-NAT clients which under normal circumstances, *should* be good enough. BUT in this case, hardly anybody can send e-mail - and of course, the PC's work flawlessly. I don't want to sound like a Mac Basher, but why must EVERYTHING be so darn difficult, the moment Macs enter into the picture???? Thanks very much in advance for any info you can offer. Mike