[exim] Case Sensitivity problem

I'm using this conditional in an ACL:

warn    message    = X-Verify-failure: Sender domain does not match 
received hosts! $sender_address_domain
    log_message = Fraud - Sender domain does not match received hosts! 
$sender_address_domain
    senders = *@dbm;/etc/exim/run/verifylist.db
    !condition = ${if 
match{$h_Received:}{$sender_address_domain}{true}{false}}

But - if the sender is using mixed case domains "Wellsfargo.com" instead
of "wellsfargo.com" it doesn't work.

How do I make this case insensitive?

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Marc Perkel - marc@???

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