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?