I have a client whose email service provider is using SPA (Secure Password Authentication). If I enable the POP3 Proxy, it fails every time, and there are no errors recorded in the filter log. If I disable the POP3 Proxy and permit the internal clients direct access to the external server using POP3, then everything works fine. The dilemma here, of course, is that I can't enable virus protection for email with this arrangement. Does the POP3 Proxy not support mail connections that use SPA?
-Steve
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