Can you use a global stamp on domestic mail

In the United States, the answer is generally no, you cannot use a global stamp on domestic mail. Here's why:

However, there are a few exceptions and considerations:

In general, it's best to use the correct postage rate for your domestic mail to avoid overpayment or underpayment. You can use a Forever Stamp or a First-Class Mail stamp, which are specifically designed for domestic mail.