I am trying to find a good solution to implement POP3/SMTP support on an Exchange 2000 server. We have approx. 100 internal users and 200 external users that utilize Exchange in one way or another. The internal users use an Outlook client and we forward email to a lot of external users' ISP accounts. I am trying to figure out a way to securely let the 200 external users access their email via Oulook Express without using any kind of VPN. I know that by default pop3 sends usernames and passwords in clear text and this would be unacceptable. Is there a good solution to this? I've read that ISA server 2000/2004 is a good way to frontend pop3/smtp but I haven't heard of anyone using it for this purpose. The other concern is that I'd want external users to authenticate to send SMTP but not the internal users. Any help would be greatly appreciated. Thank you.
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