yes, check is also cash, meaning not property
here:
You and your spouse or former spouse do not file a joint return with each other
You pay in cash (including checks or money orders)
The payment is received by (or on behalf of) your spouse or former spouse
The divorce or separate maintenance decree or written separation agreement does not say the payment is not alimony
If legally separated under a decree of divorce or separate maintenance, you and your former spouse are not members of the same household when you make the payment
You have no liability to make the payment (in cash or property) after the death of your spouse or former spouse, and
Your payment is not treated as child support or a property settlement