I'm using thunderbird: 115.16.0esr on Kubuntu Linux 22.04 LTS and have the same problem as [https://support.mozilla.org/en-US/questions/1447092 this] Archived, yet unresolved problem: """When I get a meeting invite, and accept that invite, selecting "send a response now", no message ever arrives at the email of the inviter and no email ends up in any of my folders (drafts or sent). It is like nothing happens. The event *is* accepted and added to the calendar, but no respose is created or sent. """ * I can send a normal Email to the sender of the invite. * The Email is configured in the calendar The only differences to the other thread are : * My Email is hosted somewhere else. * I use Nextcloud Calender via WEBDAVS, instead of the local calendar * The invite I receive is created in outlook. Any help is appreciated. Thanks!