I have configured Thunderbird Calendar to subscribe to three network calendars hosted on my Synology DS216Play DSM server. All is working perfectly, including with my Android device, in terms of scheduling and syncing, EXCEPT that all my invitations have "Forrest@local.host" as the organizer. When my invitees receive the event, they cannot accept it and acknowledge it because this is obviously not a valid email address. I have configured the correct email addresses for each of the three calendars, which are shown as the "from" addresses in the event invitation email, but the organizer field is always wrong. If I send an invitation from a LOCAL calendar (not NETWORK), the organizer field is correct, being the same as the configured email address. All calendars are configured for client side event notification.