A guest list, not a guess.
People you have emailed, replied to, starred, or have in your contacts walk right in at no extra cost. The list builds itself in the background and grows naturally as you use your inbox.
The standard play.
Most spam protection works by classifying messages. The filter reads each incoming email, looks at sender reputation, link patterns, vocabulary, and history, and produces a probability score. Above some threshold, the message goes to spam. Below it, the message reaches the inbox. Gmail does this. Outlook does this. SaneBox does this with a different goal (importance sorting) but the same shape: a model guessing where each message belongs.
Where it falls short.
- A model that scores each message has false positives by design. When it guesses wrong, real email vanishes into spam or junk. You only notice when you go looking.
- AI-written outreach now reads like a normal first email. Content classifiers struggle to tell a cold pitch from a real introduction.
- Cold email is technically not spam. One sender, one recipient, decent grammar, no bulk infrastructure. Filters trained to spot bulk patterns let it through.
- Sender reputation is a moving target. New domains start clean. Compromised accounts inherit a clean history.
- When the filter retrains, the set of false positives changes. The model is never finished, and "fixing" one wrong answer creates a different one.
Rythm’s approach.
Three things change when the protection is economic instead of probabilistic.
A small cost on strangers.
Unknown senders pay a small cover charge (about four cents by default, you set it). At scale that breaks the math on bulk outreach. At one-on-one, real people barely notice.
Nothing is silently buried.
Senders who do not pay sit in a waiting room you can rescue from in one click. Rescuing adds them to your guest list for good. No model, no hidden score, no message lost to the spam folder.
What Rythm doesn’t do here.
Rythm does not replace your provider's bulk-spam filter, and you should keep it on. Gmail and Outlook are both effective at the obvious cases (mass blacklist domains, classic phishing kits, malware payloads). Rythm sits on top of that layer and handles the message a content filter cannot reliably catch: the well-crafted cold outreach from a clean-looking sender. If your problem is purely volumes of bulk spam, Rythm is overkill. If your problem is the cold pitch, the AI-written pitch, or the legitimate-looking message from someone you do not know, that is the layer Rythm adds.
One plan. One price.
Keep your existing Gmail or Outlook. Cancel anytime.
$1.65
per month
Annual on Lightning includes one bonus month. See full pricing.
Frequently asked
Keep reading.
Email security for solo attorneys
Wire fraud and client confidentiality at consumer pricing. No IT department needed.
Email security for medical practices
HIPAA-adjacent inbox protection that does not store patient communications.
The best way to stop spam emails in 2026
A field guide to economic friction, why content filters keep losing, and what to do about it.
Why your Gmail spam filter is not enough
Gmail is good at bulk spam. It struggles with everything else. Here is what fills the gap.
Why am I getting so much spam?
A short answer to a question that gets longer the more you ask it.
