Sieve vacation :addresses match only case-sensitive?

[Philipp Faeustlin]

The recipients in the vacation :addresses String list are matched 
case-sensitive.

If the recipient gets a mail with wrong case, the message is discarded with:
"discarding vacation response for implicitly delivered message; no known 
(envelope) recipient address found in message headers"

I think the matching should be case-insensitive.

Is this a bug or do I miss some option?

I'm using Dovecot 2.3.7.2, Pigeonhole version 0.5.7.2.

-- 
Philipp Fäustlin

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