[Bug] Sieve vacation :addresses match only case-sensitive?

[Philipp Faeustlin]

>     It is not recommended to rely on local-part case, but it is indeed
>     case-sensitive.
> 
>     And this is to avoid such issues that postfix supports address
>     cleanup/canonicalisation before forwarding mails to dovecot.
> 
>     ----------
>     RFC 5321:
> 
>     "Local-part     = Dot-string / Quoted-string ; MAY be case-sensitive
>     […]
>     While the above definition for Local-part is relatively permissive,
>     for maximum interoperability, a host that expects to receive mail
>     SHOULD avoid defining mailboxes where the Local-part requires (or
>     uses) the Quoted-string form or where the Local-part is case-sensitive."
> 
> 
> 
> 
> And therefore “receive liberally” policy that wants to assume 
> case-insensitivity should single-case the address IN THE COMPARISON.
> 
> 
The local-part MAY be case-sensitive, but in general I don't know any 
mail addresses where the case matters.
Thus it is hard for me to understand, why this comparison of the 
vacation address is case-sensitive. Whether the final recipients address 
is also treated case-insensitive.

If this has to be case-sensitive to be RFC compliant, then please create 
an option for admins or users to change the behavior to an 
case-insensitive comparison.

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