[Mimedefang] Multiplexor Error

[Steve Robb]

've had MD 2.15 running for about a week now and I think I have it tuned and
operating fairly well in conjunction with File::Scan and SpamAssassin. The
only error message that I get occasionally (1 or 2 times a day) is - 

     ...[ID 847421 mail.error] Error from multiplexor: error: No free slaves

Is this something to be concerned about or am I just running into an
occasional lack of resources?

TIA

Steve Robb