troubleshooting Question

Sending SMTP email via Office 365 results in error: 5.4.1 Recipient address rejected: Access denied [BN1BFF011FD005.protection.gbl].

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canuckconsultingFlag for United Kingdom of Great Britain and Northern Ireland asked on
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Sending emails via SMTP using Office 365 resulting in an error of  5.4.1 Recipient address rejected: Access denied [BN1BFF011FD005.protection.gbl].  This occurs for four of our > 100 users and only when sending mail via SMTP.  

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