[13.0][IMP] mass_mailing: add unsubscribe headers in mailing emails #96
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Globally a backport of odoo/odoo@c0775de where mail sent through mass mailing now have unsubscribe headers set. This requires a small update in the send method to allow email-specific headers; previously to this commit only generic headers from the mail.mail were considered.
With some fixes, notably csrf is disabled on unsubscribe route as it is now called directly as one-click, without form and csrf. This is necessary notably to allow famous email readers to include links directly in their UI.
Task-3932001 (Mail: Unsubscribe Headers Everywhere)
Description of the issue/feature this PR addresses:
Current behavior before PR:
Desired behavior after PR is merged:
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