Error while writing to "/tmp/procmaillog"

I am having an ocaisional error causing a bounce. The log reads:

Mar  9 07:17:41 mail procmail[23539]: Error while writing to 
"/tmp/procmaillog"

Almost all mail gets through.

Any clues appreciated.

Regards,
David Koski
david(_dot_)nospham(_at_)kosmosisland(_dot_)com

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