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I am a bit confused here, since i can find List-unsubcribe header in scheduled.php but by checking my email on mail-tester.com it say cannot find List-unsubcribe header!
How do i resolve this error.
The List-unsubcribe header is added to every campaign sent.
Please update to the latest version and try again. Also try sending a campaign to a list with only your email address inside, then check the raw source of the email, you should see the List-unsubcribe header inside.
Thanks for the tip, that resolved the issue. Cheers!