CalDAV sync for shared calendar?

Problem reported by Helge - 9/1/2025 at 12:15 AM

Submitted

Hi there!

I am an end user for SmarterMail and as the primary admin I have set up a shared calendar for a user group ("family"), which has 'manage' capabilities set. All family units are members of this group and a single user (my main account) was shared the calendar directly, in addition to the group. Local apps with various deviced (I tried iOS calendar, macOS calendar, eM client & Thunderbird) are connected via CalDAV to this shared calendar.

My problem: When I create an event on this shared calendar, it is propagated to the other devices, as it should be. However, when I delete this event on a device, this change is not synched back to the shared calendar or even reappears immediately (in eM's case). No errors in the logs (where I could find them, which was only eM & thunderbird).

Any idea what could cause this and how to change this behaviour? 'manage' should include read/write acces and deletions, correct? SmarterMail is version "SmarterMail Enterprise, Build 9371 (Aug 28, 2025)"

Thanks!

2 Replies

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Douglas Foster Replied

9/1/2025 at 4:43 AM

We quit using CalDav once SmarterMail supported MAPI and we got rid of Office 2010 and 2013. But our experience with it was pretty good.

I am a little confused by your comments about your setup, so the general principle that I would pursue is to simplify as much as possible. The downside is that if this requires reconfiguration, there is no easy way to move entries from an old calendar to a new one.

We tried to use only domain-shared calendars. Some employees share personal calendars, but that became a problem as soon as the person who created it changed roles or terminated employment. You hopefully will never have that problem with a family calendar, so maybe personal calendars could work also, but I would stick to domain-shared calendars. Then I would share to each account as individuals, rather than a group/ This is to ensure that the group membership is not confusing CalDav. If you stick with a group assignment, I would ensure that nobody is authorized twice, once as a group member and again as an individual.

Helge Replied

Today at 2:07 AM

Sorry for the late answer, but I have now tried again with a domain-shared calendar (at least a calendar with 'everyone' marked as being able to 'manage'. However, I found that an event created somewhere can be moved, edited, renamed by different members but not deleted. I tried with several CalDAV frontends (Calengoo, which has the most details about CalDAV events, Rainlendar, iOS/macOS calendar, eM client) and it's always the same behaviour: With a shared calendar, as soon as you delete the event, it is immediately repopulated and the deletion does not propagate. Apparently (see below for a log snippet) SM responds to the CalDAV request with an error, which is why the event is not deleted.

Is this something known or should I open a ticket with SmarterTools?

The log shows the following:

INFO: CalenGooRequest: httpx://eu1.workspace.org/webdav/calendars/domain.org/_/cal-ID.ics
Sep 11, 2025 11:02:45 AM com.calengoo.common.network.b a
WARNING: Error: <?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="httpx://smartermail/ns">
  <s:exception>SmarterMail\DAV\Exception\NotAuthenticated</s:exception>
  <s:message>Resource was Not Found.</s:message>
</d:error>

Addendum: I quickly hosted a local SmarterMail instance where I have admin rights and can see the logs and it exhibits the exact same behaviour. The logs are as follows:

[2025.09.11] 13:04:54.128 [] Object reference not set to an instance of an object.
[2025.09.11]    at MailService.Repositories.DomainRepository.UpdateFolderSize(String accountName, Int64 folderId, Int64 folderSize)
[2025.09.11]    at MailService.Repositories.DomainRepository.AppointmentRemoveMultipleByUid(String currentUser, String ownerName, Int64 folderId, IEnumerable`1 uids)
[2025.09.11]    at MailService.Repositories.DomainRepository.AppointmentRemoveByUid(String currentUser, String ownerName, Int64 folderId, String uid)
[2025.09.11]    at SmarterMail.Protocols.WebDAV.WebDavUser.DeleteAppointment(String accountName, Int64 folderId, String uid)
[2025.09.11]    at SmarterMail.Protocols.WebDAV.Resources.CalendarAppointmentResource.ExecuteDelete(IWebDavUser callingUser, WebDavCommandRequest request, PathTokenizer segments)
[2025.09.11]    at SmarterMail.Protocols.WebDAV.Handlers.CalendarAppointmentHandler.ExecuteDelete()
[2025.09.11]    at SmarterMail.Protocols.WebDAV.Commands.DeleteCommand.Execute()
[2025.09.11]    at MailService.Remoting.Mail.WebDAVProcessCommandStatic(WebDavHandlerState state, WebDavCommandRequest request)

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