Email Protection — deterministic filtering for Gmail and Outlook.
Posts on how Rythm protects Gmail and Outlook inboxes with a dual-layer deterministic filter — identity plus cost, both user-controlled.
Email Security for Individuals: What Actually Works
Most email security writing is for IT teams. Here's what actually works for individuals protecting a personal Gmail or Outlook inbox in 2026.
200 Units, 50 Vendors, 400 Tenants: How Many of Those Emails Are Real?
Property management inboxes are vendor-invoice gold mines for attackers. Here's a structural filter that doesn't slow down a high-volume operation.
How to Defend Your Inbox From Phishing in 2026: A Realistic Guide
Most phishing defense advice is outdated. Here's what actually works in 2026, across individuals, small teams, and the structural layer nobody talks about.
Nonprofit Email Security Without the Enterprise Price Tag
Donor impersonation, grant fraud, board spoofing. Nonprofits carry every threat large organizations do, on a fraction of the budget. A $1.65 answer.
One Agency Inbox. Dozens of Client Accounts at Risk.
Agency inboxes sit between attackers and every client platform you touch. One phishing click can cascade. A structural filter for small agencies.
What Is the Best Way to Stop Spam Emails in 2026?
If you googled this, you probably tried the obvious things. Here is what actually works in 2026, including the last line of defense most guides miss.
One Fake Subcontractor Invoice. The Right Letterhead. The Wrong Bank Account.
Invoice fraud is rampant in construction. Every job brings new contacts, which is what attackers count on. A structural filter for a fast operation.
Small Healthcare Practices and the Email Breach Problem
Average healthcare email breach: $10.93M (IBM). Average small practice IT budget: near zero. A structural filter layer that costs less than dinner.
Evaluating Rythm: A Security & Architecture Guide for IT Teams
Security and architecture guide for IT teams evaluating Rythm. Data handling, OAuth security, attack surface analysis, and compliance.
Real Estate Wire Fraud Starts in the Inbox. A Bouncer Belongs There.
Wire fraud drained real estate of $446M in 2023. Every attack starts with one email. Here's how to put a bouncer on the inbox where it begins.
5 Types of Phishing Emails That Fool Gmail in 2026
Gmail catches 99.9% of phishing. These are the types that get through, and why they're getting harder to spot.
Business Email Compromise: The $2.7 Billion Threat Your Spam Filter Ignores
BEC attacks cost businesses $2.7 billion in 2023. They bypass every spam filter because they look exactly like real email. Here's what actually helps.
The Big Day
Phishing doesn't work on careless people. It works on your best employee, on their busiest day, when their guard is naturally down.
Why Your Gmail Spam Filter Isn't Enough Anymore
Gmail catches 99.9% of spam. That sounds great until you realize what the other 0.1% looks like in 2026, and why the miss rate is climbing.
Why Phishing Emails Are Getting Harder to Spot in 2026
Phishing in 2026 is no longer typo-ridden Nigerian princes. Here is why the new generation of attacks evades training, filters, and human attention.
The 7 Phishing Patterns Every Knowledge Worker Should Recognize
Modern phishing has settled into a small number of repeating shapes. Here are seven patterns to recognize and the defense each one requires.
Business Email Compromise Survival Guide for Small Businesses
BEC attacks cost small businesses an average of $125,000 per incident. Here is a realistic survival guide for teams without IT departments.
The Anatomy of a Modern Phishing Email (with Annotated Examples)
Modern phishing emails are clean, contextual, and hard to spot. Here is a structural breakdown of the parts that matter and what each one signals.
Why Microsoft 365 Phishing Is Now the #1 Vector
Microsoft 365 phishing has overtaken every other vector in 2026. Here is why attackers target it specifically and what defenses actually work.
CEO Fraud: How One Email Can Cost a Company $125,000
CEO fraud is the BEC variant where attackers impersonate company leadership. Here is the anatomy of a successful attack and what works.
Spear Phishing vs Mass Phishing: What Actually Hits Your Inbox
Spear phishing targets one person specifically. Mass phishing blasts millions. Here is what actually hits your inbox in 2026 and how to defend each.
Why Your Bank Will Never Call You About Your Account
Real banks do not call to ask for verification. Here is why, what calls and emails are actually phishing, and how to verify any banking communication.
What Is BEC (Business Email Compromise)?
Business email compromise is the largest single category of cybercrime loss. Here is what it is, how it works, and why filters cannot reliably catch it.
Why Google Workspace Phishing Is Different from Microsoft 365 Phishing
Workspace and M365 face similar attacks with different structural properties. Here is the honest comparison and what each defense looks like.
The History of Email Phishing: 1996 to 2026
From AOL credential theft to AI-generated BEC. Three decades of email phishing evolution and what each era revealed about the underlying problem.
Wire Fraud Email Scams: An Industry-by-Industry Breakdown
Wire fraud email scams cost billions every year. Real estate, legal, healthcare, and accounting take the worst losses. Here is the industry breakdown.
Vendor Impersonation: The Quiet Phishing Vector Nobody Talks About
Vendor impersonation is the quiet, high-loss phishing vector hitting small businesses every week. Here is how it works and what stops it.
Tax Season Phishing: Why CPAs and Their Clients Get Hit Every April
Tax season is high season for email fraud against CPAs and their clients. Here is how the attacks work and the realistic defenses for small firms.
Healthcare Phishing: The HIPAA Breach Vector Nobody Trains For
Healthcare phishing produces some of the largest HIPAA breaches every year. Here is how the attacks work and why generic training does not stop them.
Real Estate Wire Fraud Cost the Industry $446M Last Year. Here Is Why
Real estate wire fraud cost the industry hundreds of millions last year. Here is the structural reason and what defenses actually work.
Phishing Awareness Training: What It Catches and What It Misses
Phishing training reduces click-through but does not eliminate it. Here is the honest read on what training catches, what it misses, and where filters fit.
Multi-Factor Authentication Doesn't Stop Phishing. Here Is What It Does
MFA prevents most credential-only attacks but does not stop phishing. Here is the honest read on what MFA achieves and where it falls short.
The Lookalike Domain Problem: Why .co Is Not .com
Lookalike domains are the structural reason most wire fraud and BEC attacks succeed. Here is how the trick works and what defenses actually catch it.
The 24-Hour Rule: Why You Should Never Act on Urgent Emails Immediately
Urgent emails are statistically more likely to be fraud than legitimate. Here is the 24-hour rule and why it works in real-world threat scenarios.
Email Header Forensics: How to Read a Suspicious Email
Email headers contain forensic evidence about the sender. Here is what to look for, how to read them, and what the headers actually prove.
Calendar Invite Phishing: The Vector Nobody Saw Coming
Calendar invite phishing exploits a trusted UI surface. Here is how the attack works, why it succeeds, and what defenses actually catch it.
QR Code Phishing (Quishing): Why It Works and How to Spot It
QR code phishing exploits the gap between desktop email scanning and mobile QR scanning. Here is how the attack works and how to spot it.
The 'Sent From a Mobile Device' Sign-Off Phishing Pattern
The 'Sent from my iPhone' sign-off has become a phishing tell. Here is how attackers exploit it and why it works against trained users.
Why 'It Looks Like It's From Your CEO' Is Always a Red Flag
Email impersonation of executives is the canonical BEC pattern. Here is the structural reason it works and what the realistic defenses look like.
Voice-Cloning + Email Phishing: The Hybrid Attack of 2026
Voice-cloning combined with email phishing produces hybrid attacks that defeat verification protocols. Here is how the attack works and how to defend.
The Slack/Teams Phishing Pivot: How Email Is the Entry Point
Slack and Teams phishing usually starts with an email. Here is how the pivot works and why email-layer defenses still matter for chat-platform compromise.
Account Recovery Abuse: The Other Email Attack Vector
Account recovery flows are a meaningful attack vector that is often underdefended. Here is how the abuse works and what defenses actually catch it.
The Time-Sensitive Trick: Why Urgent Emails Are Always Suspicious
Time pressure is the most common technique in social engineering. Here is why it works, the canonical patterns, and how to recognize it in real time.
Romance Scams Start With Email: How to Recognize the Pattern
Romance scams cost victims $1B+ annually. Most start with email or messaging contact. Here is the recognizable pattern and how to spot it early.
Phishing Defense for Solo Operators (No IT Department)
Solo operators face the same threats as enterprises with none of the resources. Here is the realistic defense stack for individuals without IT support.