5 articles
A challenge response email system stops unknown senders from reaching your Gmail inbox until they prove they're human. Here's how it works, how it compares to alternatives, and how to set one up.
AI cold email spam is flooding Outlook inboxes at scale. Here's exactly how email CAPTCHA for Outlook works, what your options are, and which approach actually stops it.
Email CAPTCHA blocks AI-generated cold email by requiring unknown senders to verify they're human before reaching your inbox. Here's exactly how it works and why it outperforms traditional spam filters.
Mail CAPTCHA stops AI-generated cold email spam before it reaches your inbox by requiring senders to pass a human verification challenge. Here's exactly how it works and why traditional spam filters can't keep up.
Learn how sender verification email systems authenticate legitimate senders and block AI-generated cold email spam at the gate.