I read in transport(5), virtual(5), et al that Postfix will case-fold query strings, but for one specific project I need it to not do that. Are there any tunables for this? I didn't see anything in postconf -d output that looked related.

The short explanation is that I need to be able to do lookups against a strict-match-only case-sensitive database and the records are mixed case (e.g. al...@example.com). I'm fully aware of how stupid that is but this is not my data, not my system, not my money.

If this isn't possible, can someone point me toward the code I would need to change so I can create a local, unsupported version if that ends up being my only recourse?

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