Just wondering if iTIP support is available on a Postfix/Dovecot/Roundcube + Calendar configuration. I have installed the Calendar plugin on Roundcube from Kolab (https://plugins.roundcube.net/#/packages/kolab/calendar) and I noticed in the configuration it has the ability to send 'anonymous iTIP requests'.
Only if iTIP support is possible, how can I configure my already secured Postfix/Dovecot installation for sending anonymous iTIP requests without compromising the overall mail server security?