Ahhh! Thank you! I completely forgot about the -xc switch.  It's working now.  
I have it as this now and it works perfectly for what i need it for:

mminfo -avot -t "two years ago" -q type="LTO Ultrium-4" -q "olabel<='06/06/13'" 
-r "volume(25),barcode, type, volaccess(25), volflags, volretent(25), 
olabel(25), labeled(25), mounts, location(25), recycled(15)" -xc, | sort -u | 
grep -e volume -e 6m > ~/output.csv ; uuencode output.csv output.csv | mail 
my@address

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