How to Fix It
The recipient's email server won't accept your message because it appears to violate their security or policy settings. Check the Reported error below to see if you can determine why it was blocked. Then try one or more of the following:
• If the error mentions SPF, DKIM, or DMARC issues, forward this message to your email admin for assistance.
• The recipient's email server might suspect that your message is spam. Follow the guidance in this article: E-mailing Best Practices for Senders. Then resend your message.
• If the error suggests your message is too large, try to reduce the size of your attachment. If that isn't possible, place the file on a publicly accessible cloud storage location, like OneDrive. Then add a link to the file in your message, and resend the message.
• Contact the recipient (by phone, for example) and tell them to ask their email admin to add you or your email domain to their allowed senders list.
If the problem continues, forward this message to your email admin. If you're an email admin, refer to the More Info for Email Admins section below.