How to avoid that in Outlook at CC or BCC weird outlook addresses with numbers or weird texts appear that even look malicious

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How to avoid that in Outlook at CC or BCC weird outlook addresses with numbers or weird texts appear that even look malicious

M B 0

When writing mails, weird addresses at CC or BCC do appear. Addresses with numbers and at end @outlook.com also appeared one saying phising and some numbers ending with @outlook.com
All really all recomendations have been followed, cache has been deleted on PC and on Web Outlook it seemed to work but but the problem persists as it came back again after a few days. The problem is not on my PC, also have had my anti virus running, the issue seems to be on Web Outlook, there seems to be a vulnerability in the system it seems and these weird mail adresses can not be found and not be deleted. It looks like that Web Outlook itself has issues that are not solved. Or is there a master plan to get rid of this??

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Answer 1

Chloe-L 13,700 Personal externo de Microsoft Moderador

I noticed your post is in the Spanish (es-ES) community, but since your message is written in English, I'll go ahead and reply in English as well. If you'd prefer a response in Spanish, just let me know and I'll be happy to translate it for you.

Hi M B,

Thank you for reaching out, and I understand how concerning it must be to see strange or phishing-looking addresses appearing in your Cc/Bcc fields.

What you're seeing in the To/Cc/Bcc fields are AutoComplete (Suggested People) entries, not actual contacts in your address book. Outlook on the web keeps its own separate AutoComplete cache (independent from desktop Outlook), and it automatically stores any address you've ever typed, replied to, or that appeared on a thread you interacted wit. That's why they reappear even after clearing browser cache.

So this isn't a vulnerability or a compromise of your account, and the good news is you can clean it out.

How to remove the unwanted entries

In Outlook on the web, click New mail.
Start typing the first few characters of the suspicious address in To, Cc, or Bcc.
When it appears in the dropdown, hover over it and click the X to remove it.

Please allow up to 24 hours for the change to fully sync.

To clear the entire list at once: Go to Settings (⚙️) > General > Suggested replies / Privacy and data and toggle Suggested people off. You can re-enable it afterward to start fresh.

Tip: Whenever a phishing message arrives, please use Report > Phishing so Microsoft can take action against the sender, and as always, keeping 2-step verification enabled at https://account.microsoft.com/security to keep your account secured.

If you need anything else or if the issue persists after these steps, please don't hesitate to reach out, I'm always happy to help. And if this answer was helpful, kindly mark it as accepted so others can benefit too.

Warm regards,

Chloe-L 13,700 Puntos de reputación Personal externo de Microsoft Moderador

2026-05-13T22:12:08.31+00:00

Hi M B,

Good day to you! I'm just checking in to see if the solution we provided has resolved your issue.

Please don't hesitate to reach out if you require any further assistance.

Warm regards,
M B 0 Puntos de reputación

2026-05-14T14:45:37.4966667+00:00

It does not work, have tried all this before.
Chloe-L 13,700 Puntos de reputación Personal externo de Microsoft Moderador

2026-05-15T23:31:15.62+00:00
Hi M B,

Thank you for response, and I'm sorry to hear that it has not been able to resolve it yet. At the moment, these are still just temporary workarounds, as there isn’t a confirmed permanent fix available yet from Microsoft.

The best next step would be to send feedback directly to Microsoft, as this helps the product team understand the impact and prioritize a proper fix. If possible, I’d also recommend contacting Microsoft Support so they can look into your specific case more closely.

Here is how to reach Microsoft live support:

Go to: https://aka.ms/ContactOLC

Sign in with your Microsoft account if prompted

Submit your request through the support experience

I truly appreciate your patience with this, and I’m sorry there isn’t a more definitive solution just yet. If anything changes on your side, please feel free to share it here.

Best regards,