Problem with adding Additional header


Active Member
MailWizz 2.0 Tester
Hi, We know that gmail doesn't support FBL, But we can use other method, With adding special header.
We need "Header name" with "List-Unsubscribe"
and with value that point to abuse page or mailto FBL account,
with this method gmail will be appear a link like image below:

I try to add "List-Unsubscribe" header name, But could not be saved ( in delivery server config, other additional headers easily added )
And other question is that , how i can point abuse page in "Header value"?
Mailwizz adds List-Unsubscribe header automatically for you.Send a test email at and look at headers, you'll see the header there ;)
You can do it from an extension with a filter hook like:
function($headers, $campaign, $subscriber, $customer, $server, $emailParams
) {
    $reportAbuseUrl = $options->get('system.urls.frontend_absolute_url');
    $reportAbuseUrl .= 'campaigns/'. $campaign->campaign_uid . '/report-abuse/' . $campaign->list->list_uid . '/' . $subscriber->subscriber_uid;
    $headers['List-Unsubscribe'] = $reportAbuseUrl;

    return $headers;