Go to www.mail-tester.com and click on the "Copy the email address" button. This will provide you with a unique email address to which you will send your test campaign, include the test email address provided by www.mail-tester.com in your list.Do you have an idea why ? We have to change headers or something else ?
'campaign.track.open.url.segment' => 'to',
This isn't correct, instead of ''params' => array(
'campaign.track.open.url.segment' => 'news.track.open.url.segment',
),
news.track.open.url.segment
'params' => [
'email.custom.header.prefix' => 'X-',
'campaign.track.click.url.segment' => 'tc',
'campaign.track.open.url.segment' => 'to',
],