Free tools
Unsubscribe link checker
Paste HTML body or headers from a draft campaign message.
What this checks
Visible unsubscribe URL, List-Unsubscribe header presence, HTTPS usage, and one-click support hints.
Why it matters
Valid unsubscribe paths are required for permission-based marketing and reduce complaint rates.
Results
Common issues
- Unsubscribe links buried in footer fine print without clear labeling.
- HTTP unsubscribe URLs on marketing messages.
- Missing List-Unsubscribe header when one-click unsubscribe is supported.
How to fix
- Place a visible, labeled unsubscribe link in the message body.
- Use HTTPS for all unsubscribe and preference URLs.
- Add List-Unsubscribe and List-Unsubscribe-Post headers where supported.
How MailFleet helps
MailFleet responsible sending workflows emphasize unsubscribe visibility and permission-based list handling.
Related free tools
Delivery note: MailFleet helps users manage campaigns through their own sending providers. Delivery outcomes depend on sender reputation, DNS authentication, content quality, recipient engagement, list quality, provider rules, and mailbox filtering systems.
For regulatory context on commercial email in the United States, see the FTC CAN-SPAM compliance guide.
Frequently asked questions
Commercial email in many jurisdictions requires a clear opt-out. Permission-based lists should always honor unsubscribes promptly.
Get started
Prepare and control campaigns with MailFleet
Run integrated diagnostics, manage providers, and monitor campaigns from a professional desktop app.
Available on
- Windows 10+
- macOS 12+
- Linux (DEB & RPM)
Same desktop experience across every platform — one workflow for your entire team.