Deleting all messages
The following sample code shows how you can delete all messages in current user's outbox using the API.
[C#]
using CMS.Messaging;
using CMS.CMSHelper;
using CMS.SiteProvider;
using CMS.GlobalHelper;
...
// Deletes all messages in CurrentUser's outbox
MessageInfoProvider.DeleteSentMessages(CMSContext.CurrentUser.UserID);