Indicate to Client that radicale does not handle email scheduling

[h4fnp]

Hi there,

this is a feature request.

Problem description:
I use Thunderbird as a client. Thunderbird will send out invitations to participants, iff one enables the Prefer client-side email scheduling option, as described here. However, for radicale calendars this option is greyed out and cannot be enabled (it works with other servers, like NextCloud, though).

I suspect this is because radicale does not indicate to the client (i.e. Thunderbird) that radicale itself does not send invitations to participants. AFAICS this is feature is described in RFC6638.

Feature request:
Indicate to clients that radicale does not send out emails and that the client itself is responsible to do so.

I have also created a corresponding topic over at the Mozilla community.