Somewhere around 11pm, could be slightly later I can’t say for sure, there will be a brief interruption of mail services as I reboot the server holding the mail spool back into a 4.4 Linux kernel.

     The 4.8 kernel that was supposed to improve efficiency (and did, the web server is measurably faster) did break something with respect to pine and imap.  Both of these get unexpected change to the spool file errors.  I do not know if mandatory locks are not working or exactly what the problem is just yet so for now backing out the kernel upgrade on the machine that holds the mail spool.