Basecamp Keeps Sending New Sign-In Emails
Workaround available Web Updated October 21, 2026
Quick answer
Basecamp emails you whenever it doesn't recognise your device, which it remembers with a cookie. If your browser clears cookies, every login looks new. Allow cookies for 37signals.com to stop it.
Most likely fix: Turn off 'clear cookies on close'.
Symptoms
You get a 'new sign-in' security email from Basecamp every time you log in, even on the same computer.
Why it happens
- Browser clears cookies on close
- Private or incognito mode
- Manually cleared cookies
- Switching browsers or resetting a device
How to fix it
Try these in order — the most common fix is first.
1. Turn off 'clear cookies on close'
- Open your browser's privacy settings
- Disable clearing cookies when the browser closes
2. Allowlist Basecamp cookies (Chrome/Edge)
- Chrome: allow cookies for [*.]37signals.com
- Edge: Settings > Cookies and site permissions > Cookies and site data > Sites that can always use cookies > add [*.]37signals.com
3. Allowlist Basecamp cookies (Firefox)
- Go to the Basecamp login page
- Allow cookies for launchpad.37signals.com
4. Safari
- Safari has no per-site allowlist; avoid Private Windows and check for extensions that clear cookies
5. If you didn't sign in
- Change your password immediately
- Review your Launchpad Activity Log for unknown logins
This guide also covers
- basecamp new sign in notification
- basecamp keeps emailing new sign in
- basecamp security email every login
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