Fix lmtp_save_to_detail_mailbox to be case insensitive?

[dovecot at ptld.com]

> On 05-22-2022 10:53 am, Daniel Lange wrote:
> No, because that's not (easily) possible as others have pointed out already.
> FTR: It is possible but on the postfix side of things with multiple options.
> https://groups.google.com/g/mailing.postfix.users/c/1p0ubY726N8/m/D3s9V5PXHcIJ for the oldest solution I could find.


Viktor said yesterday on the postfix list that option is no longer valid in current versions,
which is why i brought this issue back to the dovecot list to see if a solution was possible.

I think anything postfix side is just a workaround and the issue should be fixed on the dovecot side.