“Warning: Could not create file E:\SCCM\inboxes\ccr.box” in smsdbmon.log

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I’ve started getting the following error in smsdbmon.log:

Warning: Could not create file E:\SCCM\inboxes\ccr.box\308202FC308201E4A0030201020210149EC80845C6C08E4A6CB705563CF87E300D06092A864886F70D01010B05003016311430120603550403130B53697465205365727665723020170D3132303630353030303830305A180F32313132303531333030303830305A3016311430120603550403130B5369746520536572766572.CPC, Error=3.