Undelivered Mail Returned to Sender

Undelivered Mail Returned to Sender

I got the below errors after sending mails to clients. Please let me know the reasons behind that.

This message was created automatically by mail delivery software.

 A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

 ERROR CODE :550 - 5.4.1 Recipient address rejected: Access denied. AS(201806281) [AM0EUR02FT003.eop-EUR02.prod.protection.outlook.com 2023-03-11T16:57:38.343Z 08DB22379E2762CE]


------------------------

2. 

Delivery has failed to these recipients or groups:

Your message wasn't delivered. Despite repeated attempts to deliver your message, the recipient's email system refused to accept a connection from your email system.

Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that their email system is refusing connections from your email server. Give them the error details shown below. It's likely that the recipient's email admin is the only one who can fix this problem.

For Email Admins

No connection could be made because the target computer actively refused it. This usually results from trying to connect to a service that is inactive on the remote host - that is, one with no server application running. 

 

 





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