Not necessarily. Auto-drafts can be sent to MM's external to your local bank. Those can be configured to prevent easy withdrawal (no checks, no bank electronic withdrawals, etc.). Regular monthly deposits can't generally be added to CD accounts. This option wouldn't satisfy the OP's regular investment needs.
Originally Posted by JDNorthface
MMA can be withdrawn from or even closed in a heartbeat. I've done it several times. That's the main draw for having one. I didn't see the OP say anything about monthly deposits. My assumption was that he had some cash that was burning a hole in his pocket, and wanted to keep his hands off it for one to two years. And I wasn't recommending a CD, because I won't touch them myself. I haven't looked lately, but the interest rates are now probably far south of two percent, even if you lock for two years. If the OP is employed, the best way for periodic deposits is through a company 401k. He can't touch that (unless they let him borrow against it) until he leaves the company.
Right now a mix of diversified bonds, possibly through an ETF vehicle, would be my choice for relative safety, and would probably earn better returns than the current lackluster equity market. That is unless you really can keep on top if it daily with day or swing trades.
(Usual disclaimer past performance does not guarantee future returns, blah, blah...blah.)
Oh.... and I'm not a licensed broker, just a tightwad.