mail delivery system error mailer daemon

i have used the same emails from my contact list for the last year but suddenly when i send messages i received the following message in my junk mail

this is driving me crazy as i need to send messages

The following message to <************************> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-'Requested action not taken: mailbox unavailable'

i am not very computer literate but i know that i havent altered anything but would appreciate any help

 

Question Info


Last updated October 28, 2018 Views 720 Applies to:
Answer

Click this link to resolve the issue:

http://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/how-do-i-interpret-the-delivery-failure-message/2f1bf9c0-8b03-4f8f-aacc-5f6ba60a73f3

Mark as Answer if its worked. Thanks.
Balamurugan_Subramaniyan

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