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Some institutions using Microsoft 365 / Defender may not receive emails sent by BCdiploma (login links, notifications...). These emails are delivered correctly, but Microsoft's security filters can mistakenly flag them as phishing and quarantine them. This happens on the recipient's side and is beyond our control.
Microsoft's email filtering has been notably unstable in recent months, with several acknowledged incidents on their side: EX1436407 (July 2026 — mailboxes incorrectly quarantined) and EX1467029 (September 4, 2026, ongoing — delays on external email, with Microsoft's own anti-spam protections identified as a contributing factor). These incidents are visible in the Microsoft 365 Service Health dashboard of affected tenants.
If you are affected, please forward this procedure to your IT department: https://docs.bcdiploma.com/technical/emaildelivery.html#improving-email-deliverability-in-office-365-exchange-online
Our emails are fully authenticated (SPF, DKIM, DMARC) and comply with industry standards. Only the recipient's IT team can override Microsoft's filtering decisions — the procedure above takes a few minutes to apply.