11335 mailx: NULL pointer errors
Reviewed by: Garrett D'Amore <garrett@damore.org>
Approved by: Dan McDonald <danmcd@joyent.com>

6488898 Fix for 6460901 only works for standards test cases; breaks everywhere else

6460901 UNIX03: *vsc* mailx(1) "next" command does not handle message lists properly

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