Microsoft 365 : Outlook – Delivery has failed to these recipients or groups – Your message wasn’t delivered because the recipient’s email provider rejected it – Remote Server returned ‘550 5.7.501 Service unavailable – Spam abuse detected from IP range

Stay positive. Better days are on their way.

Hello Everyone,

Hope you all are doing well.

Today issue and solution – lesson learned


  • I use Microsoft 365 Outlook, to send the mails and other communication.
  • While sending new I am getting Delivery failed mail from 2 to 3 days.
  • I tried in the possible ways to resolve it by removing and adding the Outlook License in Active Azure Directory to my account.
  • Also checked any permissions needed for mails from the recipient side, but my mails are not getting delivered.
  • But I found a solution and it works for me to rectify the issue, and sharing the solution here.

Issue / Error

Delivery has failed to these recipients or groups:

Receiver mail address xxxxxxxxxxx

Your message wasn’t delivered because the recipient’s email provider rejected it.

Diagnostic information for administrators:

Generating server: BM1PR01MB2498.INDPRD01.PROD.OUTLOOK.COM

Receiver mail address xxxxxxxxxxx

Remote Server returned ‘550 5.7.501 Service unavailable.

Spam abuse detected from IP range.

For more information please go to

S(2017052602) [MAXPR01MB3918.INDPRD01.PROD.OUTLOOK.COM]’

Original message headers:

Received: from BM1PR01MB2498.INDPRD01.PROD.OUTLOOK.COM
 ([fe80::81ca:e6f8:252a:5fd5]) by BM1PR01MB2498.INDPRD01.PROD.OUTLOOK.COM
 ([fe80::81ca:e6f8:252a:5fd5%7]) with mapi id 15.20.5332.012; Wed, 8 Jun 2022
 12:13:56 +0000
MIME-Version: 1.0
Content-Type: text/plain
Date: Wed, 8 Jun 2022 12:13:56 +0000
Subject: Teams Channel Demo Meeting

Outlook - Issue / Error
Microsoft 365 – Outlook – Issue / Error


  • In our company we use Microsoft 365 Outlook for email communication.
  • If someone send me an emails, my Outlook receiving the emails.
  • But when I am replaying / forward / sending new emails to somebody, the mail were getting underlived.
Outlook - Undelivered Mail
Microsoft 365 – Outlook – Undelivered Mail


In Microsoft 365 Outlook, for Sending All New Emails need to set the Default Email Account and check it always use the Default Email Account.


  • Login to Microsoft 365 Outlook with desktop app.
  • In Outlook, click on File.
Outlook File
Microsoft365 – Outlook – File
  • Now choose the Outlook Options.
Outlook Options
Microsoft365 – Outlook – Options
  • In Options, click on Mail.
  • In Mail, scroll down for Send messages.
  • Under Send messages, check the box Always use the default account when composing new messages..
  • Click on OK.

Hope this article will help you to resolve the Outlook Delivery Failed issue.

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Thank you for your support, will catch up with new article soon.

Keep learning and keep smiling 🙂


Khasim Shaik

SharePoint & Power Platform Developer at OS InfoTech

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