[Freeswitch-users] Error for emails related to faxing

[Richard-Freeswitch]

We have users who report email failures related to fax notifications.  
I'm digging for further information on how to reproduce the issue, but 
so far the only error in the FreeSWITCH log is:

EMAIL NOT SENT, error [Cannot open tmp file

In spandsp.conf.xml, spool-dir is set to /tmp.  The directory exists and 
is world readable and writeable.

fs_cli -x version returns:

FreeSWITCH Version 1.10.5-release-17-25569c1631~64bit 
(-release-17-25569c1631 64bit)

Any idea what would cause the EMAIL NOT SENT error?
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