undeliverable message

Question

On 2/5/2022 I was swamped with over 5000 messages from microsoft outlook showing undeliverable messages which had my email attached to them. I did not send and immediately changed my passwords etc. I am no longer getting this message in my inbox. However, I was not aware that I am unable to send emails. I have two handicap people that I am caregiver for and one is going through some major legal issues. Yesterday, I got a call from attorney asking for documents that I sent last week. I began searching and the emails are in my sent box. I started looking at the "junk" messages and found that none of the emails i have been sending were delivered. all were returned with this message:

******@iXXXe.net

Your message couldn't be delivered because you weren't recognized as a valid sender. The most common reason for this is that your email address is suspected for sending spam and it's no longer allowed to send email. Contact your email admin for assistance.

so now what do I do? I have gone through all sort of security checks and updates etc and still it will not send. what do i do????

Answer 1

Hi Judy D Carpenter,

Thank you for posting. May I know whether you are Microsoft 365 global admin?

If not, you may ask your admin to check the Restricted users page in the Microsoft 365 Defender portal at https://security.microsoft.com/restrictedusers to see if the user account can be unblock.

For more detailed steps information, please refer to the article: Remove blocked users from the Restricted users portal in Microsoft 365

Note: It might take up to few hours for all restrictions to be removed from the user.

Moreover, if you already tried steps above and there is no user in the Restricted users page. In that situation, you need to contact our phone support and our agent will check the issue from the backend side to further assist you.

Here is the official article about Global Office 365 Phone Support numbers. You may choose the country or region in which you are seeking support phone numbers. See Phone support

Regarding this point, we would truly appreciate your kind understanding.

Best regards,

Shyamal