12 CFR § 204.2(d)(2) The term “savings deposit” also means: A deposit or account, such as an account commonly known as a passbook savings account, a statement savings account, or as a money market deposit account (MMDA), that otherwise meets the requirements of §204.2(d)(1) and from which, under the terms of the deposit contract or by practice of the depository institution, the depositor is permitted or authorized to make no more than six transfers and withdrawals, or a combination of such transfers and withdrawals, per calendar month or statement cycle (or similar period) of at least four weeks, to another account (including a transaction account) of the depositor at the same institution or to a third party by means of a preauthorized or automatic transfer, or telephonic (including data transmission) agreement, order or instruction, or by check, draft, debit card, or similar order made by the depositor and payable to third parties. A preauthorized transfer includes any arrangement by the depository institution to pay a third party from the account of a depositor upon written or oral instruction (including an order received through an automated clearing house (ACH)) or any arrangement by a depository institution to pay a third party from the account of the depositor at a predetermined time or on a fixed schedule. Such an account is not a transaction account by virtue of an arrangement that permits transfers for the purpose of repaying loans and associated expenses at the same depository institution (as originator or servicer) or that permits transfers of funds from this account to another account of the same depositor at the same institution or permits withdrawals (payments directly to the depositor) from the account when such transfers or withdrawals are made by mail, messenger, automated teller machine, or in person or when such withdrawals are made by telephone (via check mailed to the depositor) regardless of the number of such transfers or withdrawals.
In other words...
Unlimited: deposits of any type, withdrawals in person, by ATM, by mail, or telephone (when check is mailed), and transfers to make loan payments at the same institution
Limited to 6: preauthorized or automatic transfers, telephone transfers, and transfers by check, draft, debit card, or similar order to third parties
Don't make me say, "I told you so!" Sincerely, your friendly Compliance Officer.