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All the answers to your frequently asked questions.

Your Account

How do I create an account?

If you don’t have a Sandboxx account yet, go to and click Sign Up.

You can sign up for an account using your email address, phone number, Facebook account, Google account, or Apple ID. Signing up and creating a Sandboxx account is free.

How can I change the email address on my account?

1. Go to your Profile on the bottom right of Sandboxx

2. Then, click the “Gear” icon in the top right

3. Click on the option to change your email

4. Change your email to your now corrected email

5. Click “Save” and your new email will be assigned to your account

Sending Letters

How do I address a letter to someone at basic training?

Each basic training location has its own address format, so it’s important to make sure you use the proper mailing address to ensure that your letter gets to your loved one.

Learn more about sending letters to Army basic training, Marine Corps boot camp, Navy boot camp, Air Force basic training, and Coast Guard boot camp from our Help Center.

Where does Sandboxx ship overnight?

Sandboxx ships overnight to the following bases; MCRD Parris Island, MCRD San Diego, MCB Quantico, Camp Pendleton, JBSA Lackland, CGTC Cape May, RTC Great Lakes, Fort Moore, Fort Jackson, Fort Leonard Wood and Fort Sill.

How long does it take for Sandboxx letters to arrive?

Sandboxx Letters sent Monday through Thursday before 4:30pm EST will be delivered the next day. Letters sent Friday before 4:30pm EST will be delivered on Monday. All Letters sent Friday after 4:30pm EST (to include letters written on Saturday/Sunday) will be delivered on Tuesday.

Can I fix my letter once I’ve hit “send”?

You can fix the street address and the spelling of a name in your letter but will need to contact us in order to do so. Reach our Customer Happiness team to get started. 

Can I send a letter from a different country?

Yes, you can send a Sandboxx Letter internationally. We may need to manually enter your international address into your account so that your recruit can properly write back to you. Please reach out to our Customer Happiness team for assistance with international addresses. 

Can I send letters from my computer?

Yes, you can log in to our web application using your existing Sandboxx account credentials to send a Sandboxx Letter from your laptop or desktop. The process is the same as it is on our mobile app.

Can I send letters to deployed service members through Sandboxx?

Yes, you can send Sandboxx Letters to overseas military addresses (APO/FPO). Those acronyms stand for Army Post Office and Fleet Post Office. Generally, overseas mail for Army and Air Force personnel go to APOs, and mail for Marine and Navy personnel go to FPOs. However, that is not a hard and fast rule, so use the APO/FPO that you have for your recipient. Learn more  about sending letters to APO and FPO addresses.

Is Sandboxx only for boot camp?

No, Sandboxx can be used to send mail to any military base in the world. A majority of Sandboxx letters are sent to basic training locations, but you can send a Sandboxx letter anywhere in the world. As long as the letter you are sending has a real address on it, we’ll send it anywhere.

About Sandboxx

How much does Sandboxx cost?

Sending one letter through Sandboxx costs just $4.99, with even lower costs per letter when you purchase a bundle. For that price, you get a lot more than quickly delivered mail. Through the Sandboxx app, you can write your message and even include a photo for your loved one in training in just about two minutes.

Is the Sandboxx app safe to use?

We care about data privacy and security. We have implemented appropriate technical and organizational security measures designed to protect the security of any personal information we process. Read more about our Privacy Policy

Can recruits use Sandboxx?

No, your recruit does not need the Sandboxx app before you can send any mail to him or her. You can enter your recipient’s address in Sandboxx and send a letter to them even if the recipient is not listed in the Sandboxx app.

Still Need Help?

Visit our help center for more helpful articles or email our team.