5e0b5dcab6
We tell people to examine the postmaster log if they're unsure why they are getting auth failures, but actually only a few relatively-uncommon failure cases were given their own log detail messages in commit 64e43c59b817a78d. Expand on that so that every failure case detected within md5_crypt_verify gets a specific log detail message. This should cover pretty much every ordinary password auth failure cause. So far I've not noticed user demand for a similar level of auth detail for the other auth methods, but sooner or later somebody might want to work on them. This is not that patch, though.
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