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I'm using this rewriting rule to change login names into friendly names, but if mail comes in for an upper case login name, it doesn't get rewritten.
*@my.domain ${lookup{$1}dbm{/usr/lib/exim/longforms}\ $value}fail}@my.domain bcfrtFT
The longforms database has entries of the form:
ano23: A.N.Other
Replace $1 in your rule by ${lc:$1} to force the local part to lower case before it is used as a lookup key.
$1
${lc:$1}