DMARC handling comparison for multiple email providers. SPF passing for all messages. DMARC misaligned.
Gmail
p=none (inbox) p=quarantine (spam)
Gmail shows a very prominent warning for quarantined emails, which go to the spam folder. Emails with no policy are placed on the inbox with no warnings.
Yahoo!
p=none (inbox) p=quarantine (spam)
Yahoo! just places the quarantined email in the spam folder. Other than that there's no difference, no warnings.
Outlook
p=none (inbox) p=quarantine (spam)
Outlook just shows the same little warning it does for any junk email.
ProtonMail
p=none (inbox) p=quarantine (spam)
ProtonMail shows a prominent warning for quarantined e-mails. The warning for p=none seems unrelated with DMARC, they just thought the e-mail was suspicious (well, it was).
Tutanota
p=none (inbox) p=quarantine (spam)
Tutanota also displays a prominent warning saying you should not trust the contents of the message.
All tested email providers sent p=quarantine to spam and p=none to the inbox.
Tutanota, ProtonMail and Gmail place a warning that will probably make a user think twice before trusting the email.
Outlook and Yahoo! show no specific warnings.
Regarding reporting: I received DMARC reports only from Google and Yahoo!. Other providers did not report.
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