Troubleshooting
Login Issues
“Invalid credentials” — Check username/password and Caps Lock.
“Device limit reached” — Revoke an old device from the Account section. A 12-hour cooldown applies before a new device can register.
“License expired” — Renew at krantz.run. No grace period — access stops immediately.
Checking Issues
High “Connection Failed” rate — Check internet, verify proxies work, reduce thread count, try without proxies.
Many “Rate Limited” results — Reduce threads, use more proxies, switch to residential proxies.
“Server Not Found” — Domain doesn’t exist or has no mail server configured.
Slow speed — Increase threads (Air: up to 500, Pro: up to 2000), use faster proxies.
Proxy Issues
“Proxy Error” on all checks — Verify format, test proxies manually, check auth credentials, try another provider.
Rate limited despite proxies — IPs may be flagged. Use residential proxies, add more proxies, lower thread count.
Application Issues
App won’t start:
- Windows: Install Visual C++ Redistributable
- Linux: Install WebKit2GTK:
sudo apt install libwebkit2gtk-4.1-0 - Antivirus: Add an exception for the
krantzbinary - Reinstall:
krantz update mailorkrantz update sorter
Crashes — Reduce thread count, check available memory, update with krantz update.
Getting Help
Contact support with your app version (krantz --version), OS, steps to reproduce, and error messages.
Reach us at krantz.run.