[Exim] MySql AUTH lookups failing

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I'm trying to configure exim on my server to authenticate users via MySQL looksups. I have the Lookup portion working, but I cannot make Exim understand the returned password. I have tried both in unencrypted mode (set pass="mysecret") and encrypted mode (set pass=encrypt("mysecret", "my")) and exim returns failure on both attempts. How can I configure Exim to understand the encrypted password stored in MYSql? (Yes, it was compiled with libcrypt!)

Thanks!

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