case sensitive

Hi
Can I make tha comming addresses incasesensitive

i.e
even if the mail is XYZ(_at_)abc(_dot_)com
which is suppose to be xyz(_at_)abc(_dot_)com it will go to the home folder 
"abc"
according to the setting

If the cooming mail doesnot match with any setting in the filter
(as per the above exaple )where it goes ?

Please help
regards
sagar

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