My users authenticate with POP3-before-SMTP. Can I still use spamdyke?

Probably not. If your POP3 server writes authenticated IP addresses to a file, you can use that file as an IP whitelist with spamdyke. If it keeps track of authenticated IP addresses in some other way, you're out of luck.

For example, Plesk supports POP3-before-SMTP but it writes the authenticated IP addresses to its database, which spamdyke cannot read. POP3-before-SMTP is really a kludge anyway; consider using SMTP AUTH instead. More.

Yes! As of version 2.5.0, spamdyke understands SMTP AUTH and disables all of its filtering for authenticated users. See the README page for complete details.

More.

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