Emails from haveibeenpwned.com silently blocked/not arriving in Outlook.com/Hotmail (worked in 2019, no rules or spam)

Maikel Stuijfzand 20 Reputatiepunten
2026-03-03T14:32:30.3166667+00:00

Hi everyone,

Since around 2020 or so, emails from [no reply@haveibeenpwned.com] (legitimate Have I Been Pwned notifications/verifications) no longer arrive in my free Hotmail/Outlook.com inbox. They used to deliver normally back in 2019.

What I've already checked/confirmed:

  • No custom mail rules set up to block or move them.
  • Nothing in Junk/Spam folder.
  • [no re ply @haveibeenpwned.com] and haveibeenpwned.com are not in Blocked senders/domains.
  • Added haveibeenpwned.com to Safe senders and domains (but still no delivery).
  • Tested by requesting a fresh notification via https://haveibeenpwned.com/NotifyMe → nothing arrives (not even bounced back).
  • No visible errors or traces in my account.

This seems like a server-side silent rejection/drop by Microsoft (common with stricter filtering on bulk/security senders like HIBP via SendGrid). HIBP's FAQ states >99% of non-arrivals are due to the receiving server bouncing/rejecting them.

Has anyone else run into this with HIBP emails on Outlook.com/Hotmail recently? Did adding to safe senders eventually work, or did support whitelist it/fix a hidden suppression? Any other workarounds besides using a different email for notifications?

Thanks for any advice or similar experiences!

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Diana Mariz 11,110 Reputatiepunten Onafhankelijke adviseur
2026-03-03T16:35:33.4+00:00

Hi Maikel,

You can submit a request to whitelist the domain here, just ensure that all the information needed is provided: https://olcsupport.office.com/

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  1. Maikel Stuijfzand 20 Reputatiepunten
    2026-03-03T20:15:56.0466667+00:00

    Thank you, I just created a ticket at Microsoft.

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  2. Maikel Stuijfzand 20 Reputatiepunten
    2026-03-10T08:41:32.01+00:00

    Microsoft could not solve this so I asked HIBP and they replied:

    "According to SendGrid, you'd previously reported these messages as spam, so you ended up on a suppression list. I've just removed you from the list, give it another go now."

    It works fine now, case can be closed! Thanks for your help.

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