240 questions with Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365 tags

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Defanged malicious URLs in SOC security notification emails still classified as High Confidence Phishing by Defender for Office 365

Hi, SOC security notifications may contain threat-intelligence indicators such as malicious domains, URLs and IP addresses. Throughout my years of using Microsoft email services across different organisations, I have regularly handled similar security…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-07T13:11:07.18+00:00
Mohd Irzani Bin Wahid 0 Reputation points
commented 2026-09-08T22:55:41.08+00:00
Chris Hailes 155 Reputation points MVP
1 answer One of the answers was accepted by the question author.

How to make sure Defender is working correctly

Microsoft defender always says 'no current threats', and shows 'no recent actions' in the history, even when I run a full scan. I'm concerned it's not working right. I see on-line to guidance to run DISM and then system file checker. Is there an easier…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2025-09-15T21:17:37.61+00:00
EP 20 Reputation points
commented 2026-09-07T21:21:25.5033333+00:00
john hacker 0 Reputation points
1 answer

windows security scan

Hello Windows security when trying to scan quick or full scan it takes very long time and never continue it stuck , as it was not like this but this happened since the two days ago and still . So, please resolve this issue as am sending you the…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-04T23:32:40.16+00:00
asmahan gbara 0 Reputation points
answered 2026-09-05T09:49:52.8866667+00:00
Bence Weiszmann 1,555 Reputation points
0 answers

Received an email in junk folder with header New apps have access to your data

I received this email from this address account-security-noreply@accountprotection.microsoft.co3 It goes on to say "New files connected to the microsoft account **" then a hotmail email that I don't recognize (appears to be first name…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-03T12:40:28.1066667+00:00
User1 0 Reputation points
0 answers

How to fix this issue: Blocked due to organizational overrides. Update or remove the "FileTypePolicy" action from the Anti-malware policy (Strict Preset Security Policy1656932236829)

We are sending an internal email, but the email is bouncing back with the following error: “Blocked by organization policy: Antimalware policy block by file type.” However, the file type is not included in the blocked file types list, as we verified in…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-02T06:22:24.2333333+00:00
Shahnawaz Alam 0 Reputation points
0 answers

Open SSL Vulnerability libcrypto-3-x64.dll and libssl-3-x64.dll

Experiencing issues with OpenSSL vulnerabilities affecting organization security score. So far, I was not able to find any fix for it, tried updating the programs, doing windows updates even take ownership of the program file and delete manually. but the…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-03-18T16:50:17.11+00:00
alex kalapnauth 25 Reputation points
commented 2026-09-01T06:17:23.52+00:00
xeroday 0 Reputation points
1 answer

Email sending issues post-compromise

Hi there I had my email hacked a few days back and secured the account, but I cannot now get the block lifted - every email I send is met with the same : "Remote server returned '550 5.1.8 Access denied, bad outbound sender AS(42004)'" - but…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-28T12:00:05.63+00:00
Crawford Warnock 0 Reputation points
edited an answer 2026-08-30T20:13:19.51+00:00
Zoha Fatima 430 Reputation points
1 answer

how do i delete old email address that is full of malware

my old email address has changed and its been encrypted with malware and i don't use that email address anymore

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-27T21:54:54.0033333+00:00
Mike Noble 0 Reputation points
answered 2026-08-27T21:55:06.2866667+00:00

AI answer

1 answer

O365 email security

During last couple of years, several of our O365 exchange email accounts got compromised time-to-time even when MFA was enforced. During these email hacking incidents, email users did not receive any unexpected Microsoft security codes on their phone.…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-20T21:03:16.2933333+00:00
Dharshan Jinasena 0 Reputation points
answered 2026-08-20T21:03:33.3633333+00:00

AI answer

1 answer

Account holders file share notifications are being flagged as malware

When a user shares a file with another user in our tenant the notifcation is being quarantined as malware and the receipient is not getting notified of the file share through outlook. The file is accessible through onedrive and is deemed as a shared…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-13T16:19:03.63+00:00
Academy for Urban Scholars 0 Reputation points
answered 2026-08-15T10:44:28.7133333+00:00
Ahamed Musthafa Careem 671 Reputation points
1 answer One of the answers was accepted by the question author.

My anti-spam policy to allow external email forwarding doesn't work

I've read all the documentation (Configure outbound spam policies for cloud mailboxes) and configured a policy in Defender to allow external forwarding. It is currently set for just a single user. I set that user email account to forward to its current…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-11T21:00:02.2+00:00
GraemeG-3877 60 Reputation points
commented 2026-08-12T14:29:23.3766667+00:00
GraemeG-3877 60 Reputation points
2 answers One of the answers was accepted by the question author.

Multiple Phishing Emails Bypassing ATP

We are currently under an active and ongoing phishing/spam campaign that has been continuously targeting our organization for the past several days. Despite having Microsoft Defender for Office 365 Plan 2 fully enabled and correctly configured security…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-06-04T10:54:21.2166667+00:00
Abdul Waqas 345 Reputation points
accepted 2026-08-10T07:36:43.5166667+00:00
Abdul Waqas 345 Reputation points
1 answer

Help on Permissions

Hi All, I would like to provide users with access to Microsoft Defender → Email & collaboration → Explorer. The users should have full access to the available functionality within Explorer, including searching for messages, viewing message…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-09T00:13:45.9633333+00:00
Glenn Maxwell 14,186 Reputation points
answered 2026-08-09T00:14:00.62+00:00

AI answer

1 answer One of the answers was accepted by the question author.

Recently received email

I recently received an email from Microsoft re Microsoft Defender, which went into my junk mail. Please would you confirm that it did come from you before I do an update. Thank you

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-08T11:46:58.6633333+00:00
Carol Walden 20 Reputation points
accepted 2026-08-08T11:51:05.4933333+00:00
Carol Walden 20 Reputation points
1 answer One of the answers was accepted by the question author.

How to stop the MS Defender VPN for Banking Apps on iPhone in India

Indian Banking Apps, especially the BHIM UPI app, are no longer allowed to function through VPNs. Thus, one has to close MS Defender to use these apps. Is there a way to automate the process and allow these apps to bypass the VPN and connect directly?

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2025-12-26T15:56:59.22+00:00
Vivek Kaul 20 Reputation points
commented 2026-08-03T08:38:48.8+00:00
Wieczorek, Krystian 0 Reputation points
0 answers

NordVPN pop ups

Recently NordVPN pops up on my monitor after I log on. It mentions a TLS certificate, which i'm not familiar with and if I don't trust it, to cancel. If I do trust it I can select it at my own risk. It states that NordVPN might be trying to intercept my…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-07-25T16:37:31.35+00:00
patti grant 20 Reputation points
2 answers

Defender Prime Express

Your site has said that the mail about renewal of Defender Prime Express is a scam. Do I just disregard the email? TIA

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-07-21T17:14:03.9366667+00:00
Barbara Larsen 0 Reputation points
answered 2026-07-22T00:40:58.73+00:00
Bulldog 4,235 Reputation points
1 answer

PLease help me fix this error which i have received and has disabled my mail from being delivered. I have logged into Defender but am unable to understand if i have resolved the problem.

Diagnostic information for administrators: Generating server: AS8PR01MB7672.eurprd01.prod.exchangelabs.com ******@gmail.com Remote server returned '550 5.1.8 Access denied, bad outbound sender AS(42004)' Original message headers: Received: from…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-07-15T10:20:15.35+00:00
Sam Laite 0 Reputation points
answered 2026-07-18T23:45:17.0133333+00:00
Dilawar Shaikh 0 Reputation points
1 answer

New Secure Boot certificate not updating on my computer

The secure boot certificate update has not uploaded to my computer even though it should have done automatically what should I do

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-07-16T20:58:48.2133333+00:00
Alison Masterson 0 Reputation points
edited an answer 2026-07-16T21:07:06.9133333+00:00
Marcin Policht 106.8K Reputation points MVP Volunteer Moderator
1 answer One of the answers was accepted by the question author.

Windows defender

Hi, can someone recommend a good video or doc site to get a good understanding of all features in defender, I know there is ms docs, but this is huge and really wanted something on a more practical what it can and can't do guide.

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-07-09T16:56:15.5033333+00:00
Dicken 186 Reputation points
commented 2026-07-09T17:53:44.8933333+00:00
Dicken 186 Reputation points