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

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.