Can a closed account be re-opened?

No, GunTab cannot re-open a closed account. As warned when closing an account, closure is permanent. That is because closing an account is a security measure to protect against account takeover. Allowing re-opening would defeat the purpose of that security measure.

However, if you closed your previous account and want to continue using GunTab, you are free to open a new GunTab account under a different email address.