If the account(s) configured to be used for the transport have been used for this purpose before (i.e. there's previous c2 messages in the inbox(es)), it's possible to trigger a bug where the server and client can get out of sync. Usually, this can be fixed by restarting the server, and disabling the staging process.
If the account(s) configured to be used for the transport have been used for this purpose before (i.e. there's previous c2 messages in the inbox(es)), it's possible to trigger a bug where the server and client can get out of sync. Usually, this can be fixed by restarting the server, and disabling the staging process.