We recently migrated our company to a new mail provider (Gmail), and updated our MX/SPF/DKIM/DMARC records.

Checking the DNS propagation via https://dnschecker.org/, all changes are reflected.

However, when trying to send email to a specific person, we are receiving the following NDR:

This is an SMTP server at asp.reflexion.net

Your message could not be delivered to the following address: <**redacted**>

from <**redacted**> to <**redacted**>
**redacted**.mail.protection.outlook.com:***.***.***.*** failed after I sent the message. STARTTLS proto=TLSv1.2; cipher=ECDHE-RSA-AES256-SHA384.
Remote host said: 550 5.4.1 All recipient addresses rejected : Access denied [**redacted**.protection.outlook.com]

Any advice on how to resolve? Is this just a cache issue on Outlook's part that will be resolved over time, or is there some configuration issues that we need to resolve on our end?

  • This is a (possible) problem with the domain of the user to whom you are sending the mail. – Michael Hampton May 8 at 23:17
  • You probably need to **redacted** the **redacted**. – womble May 9 at 2:51

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