postmaster undeliverable in junk box for all emails

SOLVED

I had the same issue, stemming from unusual login activity from Asia.

Go to desktop version of outlook (mobile doesn’t allow access to rules) and once logged in, go to settings > email > rules.

Delete any unrecognised rules. Mine had been sent to forward mails to an unrecognised address. Once deleted, send a test mail to yourself to confirm issue is resolved.

Hi inanch mehmet,

First of all, thank you for your reply, and I am sorry that you marked my answer as not helpful. I am frustrated because I am doing my best to help you solve the problem.

I would like you to double-check your recent activity log https://account.microsoft.com/privacy/activity-history to see if there are any logins that don't belong to you.

As well as double-checking your account Settings, be sure to check the rules in your email account. Making sure that no relevant rules are set in the rule can cause this problem.

Thank you for your patience and cooperation.

Have a good day.

Best Regards, 

Jim - MSFT | Microsoft Community Support Specialist

Hi inanch mehmet,

Thanks for using Microsoft products and posting in the community. 

Based on your description, I understand that you get emails from the postmaster when you receive email.

What I need to confirm with you is whether there has been any recent unusual activity on your account, or if it was hacked some time ago.

You can view your recent activity log https://account.microsoft.com/privacy/activity-history to see if there are any logins that don't belong to you. Prevent hackers from still being able to log in to your email.

If any abnormal login information exists. You should first full scan your computer with an antivirus program. Next, change your password. Click Sign out from all locations on the Account Security screen. All devices where you are signed in to this account will be closed after 24 hours. This prevents hackers from continuing to log into your email.

After changing your password, review your account settings as they may have been altered, affecting your account security. To check and change your account settings, go to connected accounts, forwarding, and automatic replies. Be sure to check the rules in your email account. Hackers may set up email forwarding rules to monitor your activities.

You can add Microsoft Authenticator to your phone, a free app that helps you sign in to all your accounts just by using your fingerprint, facial recognition, or PIN. Sometimes, app verification is more secure than CAPTCHA.

About Microsoft Authenticator - Microsoft Support

I hope you find my answer helpful.

Please don't hesitate to let me know if you have any further updates, thank you.

Best Regards, 

Jim - MSFT | Microsoft Community Support Specialist

Hi , I got the exact same problem with my account,

everytime I send or receive an email, my client receive a postmaster failed to deliver , even if the email is well delivered , and received

I also received one in my spam box they mostly got in spam,

the trouble start since 1 or 2 week mid august 2024

gonna try what you should suggest,

any clue, ?

I found this in the rules, I will delete it , hope it will fix the problem n

problem fix,

thx

thx

Hi  I have done everything you said however the problem is not fixed .Any further suggestions. Whenever I receive an email I get this in junk (see screenshot)