BamaMom10 - you CAN use Sandboxx while your SR is in boot camp. No need to delete your account.
In Bootcamp you are ok, but once they get to the fleet then PLEASE for everyone's sake, delete it!!
I have been useing both Sandbox and Snail mail. From everything i have read Sandboxx is not good if you are not sure exactly what ship your child is on, as the base will not forward mail to another ship if you get that wrong. They will sort and forward snailmail to the other DIV or if your child ends up in the infirmary.
With that said, my son has written that the guys in his Div like Sandboxx because the letters get there way faster than snail mail. Again, I am useing both so he has a steady stream of letters coming in.
Adele - glad your son is getting his Sandboxx letters and snail mail. I'm sure that is making him happy ;-D And yes, you are correct - if their address changes Sandboxx will not be forwarded. And with that being said just remember to discontinue use of it after boot camp (OPSEC).
Keep those letters going to him!
And when is your SR's PIR?
When my son was going to BC last year, his recruiter said not to use it if your SR had to get a higher level security clearance (spec ops, nuke, intel, etc.). If your SR isn't one of those ratings, it should be safe to use while in BC. Others have mentioned the pros and cons of using it for those who can.