Hello,

This behavior usually occurs when the unsubscribe link redirects to a login page, which should not happen for email marketing recipients.

Here are a few steps to help fix this (tested on Odoo Online):

Make sure the contact is an external one (not linked to an internal Odoo user).

➤ If the email address is associated with an internal user, Odoo may force authentication.

Ensure you're using the correct unsubscribe tag in the email template:

jinja
CopierModifier
${object.website_message_ids._unsubscribe_link()}

Or use the standard unsubscribe block provided in the Odoo email editor, which automatically includes the correct link.

Avoid testing while logged in. Test the unsubscribe link from an external email client (like Gmail) to simulate a real recipient's experience.

Hope this helps!

Good luck 🙂