Why should I use the List-Unsubscribe header?

It gives inbox providers a safe and standard way to handle unsubscribes, which reduces spam complaints and protects your domain reputation.

Is a mailto link enough for List-Unsubscribe?

A mailto link is better than nothing, but a one click HTTPS link plus mailto fallback gives the best user experience.

Do I still need an unsubscribe link in the body?

Yes. The header complements, not replaces, a visible unsubscribe link in the body of your email.

How to set up List-Unsubscribe on SendGrid

Step by step List-Unsubscribe setup for SendGrid: complete instructions, examples, verification commands, and common pitfalls.

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This is a reference guide for configuring List-Unsubscribe on SendGrid. Use it while editing DNS or when troubleshooting deliverability.

Tip: Here’s a reliable, copy-pasteable way to set up List-Unsubscribe using SendGrid. Then verify everything with the InboxGreen Free Checker.

Provider-specific notes for SendGrid

SendGrid domain authentication uses CNAME records for DKIM and a branded mail-from subdomain - not a plain TXT SPF record. Follow the exact records from SendGrid's UI.
If you send from SendGrid alongside another provider, you still need both providers in a single SPF record. Merge the includes, do not create two SPF TXT records.
SendGrid → Settings → Sender Authentication → Domain Authentication.

What is List-Unsubscribe?

List-Unsubscribe is a message header that gives inboxes a safe, machine readable way to unsubscribe. Gmail and Outlook often show a clear unsubscribe link when it is present and valid, which reduces spam complaints and protects your sender reputation.

How to enable it in practice

In your sending platform, enable the List-Unsubscribe header or macro in templates.
Use a one click HTTPS link as the main method, with a mailto address as fallback.
Test by sending to a Gmail address and checking “Show original”.

Example headers

List-Unsubscribe: <https://yourdomain.com/u/abcd1234>, <mailto:[email protected]?subject=unsubscribe>
List-Unsubscribe-Post: List-Unsubscribe=One-Click

Common mistakes

Using a broken or redirected unsubscribe link that fails when clicked.
Only providing a mailto address without a one click URL.
Failing to apply the unsubscribe globally across lists and tools.

Related for SendGrid

quick_reference_all Set up SPF on SendGrid quick_reference_all Set up DKIM on SendGrid quick_reference_all Set up DMARC on SendGrid

Pro tip: Turn on InboxGreen Monitoring to check these records daily and get alerts if something breaks.

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Check SPF, DKIM, DMARC and List-Unsubscribe for your domain in seconds.

Useful tools

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