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This 9-year-old issue me a bad taste for mailbox... https://userforum-en.mailbox.org/topic/anti-spoofing-for-custom-domains-spf-dkim-dmarc#comment-1450 https:/

• crossroadsguy 1y ago
  That's classic Mailbox. Deny there's a problem, or just don't ever respond. Hell, my tickets, when I face an issue, don't get responded to for weeks sometimes, and when it gets responded to, often it's a one-liner accompanied by closure of ticket :D