Can I ask why someone is unsubscribing?

You can offer an optional survey after unsubscribing, but do not make it required. The unsubscribe must complete regardless of whether they provide feedback.

What if someone unsubscribes then resubscribes?

If they explicitly opt back in, you can email them again. But do not automatically add back unsubscribed addresses through other means.

Do transactional emails need unsubscribe?

Pure transactional emails do not require unsubscribe under CAN-SPAM. However, Gmail and Yahoo requirements apply based on volume, not email type. And providing account management options is good practice.

Can I offer "unsubscribe from this type" options?

Yes, but you must also offer a complete unsubscribe option. Partial unsubscribe alone does not satisfy the requirement to stop all commercial email if requested.

What Are the Email Unsubscribe Requirements?

CAN-SPAM Requirements

Clear and conspicuous: Easy to find in the email
Functional for 30 days: Must work at least 30 days after sending
Process within 10 days: Maximum time to stop sending
No fees or charges: Unsubscribe must be free
Minimal information: Cannot require more than email address
No login required: Should not require account access

Gmail and Yahoo Requirements

For bulk senders (5,000+ daily messages), Gmail and Yahoo require:

One-Click Unsubscribe

List-Unsubscribe header with HTTPS or mailto option
List-Unsubscribe-Post header for one-click functionality
Unsubscribe action with single click (no confirmation page)

Visible Unsubscribe Link

Clearly visible in email body
Working link that processes the request

One-Click Is Now Required

Since 2024, Gmail and Yahoo require one-click unsubscribe for bulk senders. Missing this can result in filtering or blocking. Implement List-Unsubscribe headers with POST support.

GDPR Requirements

Unsubscribing must be as easy as subscribing
Cannot make the process unnecessarily difficult
Right to withdraw consent at any time
Should be processed immediately (not 10 days)

Best Practices Beyond Compliance

Process Immediately

Do not wait 10 days just because the law allows it. Process unsubscribes immediately to:

Reduce spam complaints
Avoid irritating subscribers
Maintain good sender reputation

One-Click in Email Body

Even beyond header requirements, make the in-email unsubscribe one-click when possible.

Preference Center

Offer alternatives to full unsubscribe:

Reduce email frequency
Select specific topics
Pause emails temporarily

But always include a complete unsubscribe option.

Confirmation

Show a confirmation page or send a confirmation email acknowledging the unsubscribe.

Common Mistakes

Hidden unsubscribe: Tiny text, same color as background
Broken links: Links that lead to errors
Login required: Forcing account access to unsubscribe
Multiple steps: Requiring confirmation, surveys, etc.
Slow processing: Continuing to send after request
Missing headers: No List-Unsubscribe implementation

Technical Implementation

List-Unsubscribe Header

Add to email headers:

List-Unsubscribe: <mailto:[email protected]>, <https://example.com/unsubscribe?id=123>

List-Unsubscribe-Post Header

Required for one-click:

List-Unsubscribe-Post: List-Unsubscribe=One-Click

In-Email Link

Place visible unsubscribe link in email footer. Link to immediate unsubscribe action or simple preference page.