Support to Fix Yahoo Mail Error 554

When I was trying to forward an email to Yahoo accounts in Hosted Email Security (HES), an error appeared on my screen as “Email Error-554 Message not allowed” and my email was not sent.

This error is causing neither by service provider nor HES (Hosted Email Security) causing this problem. According to the error code, “MX.MAIL.YAHOO.COM” is not accepting the emails because the user’s system time setting may be incorrect. Yahoo will never accept emails with a “message not allowed” error.


  • 554 delivery error: dd This user doesn’t have a account
  • 54 Denied (Mode: normal)
  • 54 Message permanently rejected
  • 554 Message refused
  • 54 no valid recipients, bye
  • 54 rejected due to spam content
  • 54 rejected due to virus
  • 54 <>: Relay access denied
  • 54 Sorry, no mailbox here by that name.
  • 54 Spam detected
  • 54 Invalid recipient
  • 54 Malformed emails denied
  • 54 Message is not RFC compliant; missing “Date” header
  • 554 Message not allowed


1. When sending an email to an HES – Inbound Filtering user, the sender receives a Non-Delivery Receipt with the following SMTP error:

554 5.7.1 Recipient address rejected: Access denied.
The issue only occurs on specific email addresses. The issue happens when the Directory Management or the Active Directory (AD) Sync client is enabled. Both of these features use LDAP directories.

Solution: The email address should be added to the list uploaded or on the Directory Management feature, or synchronized with the AD Sync client.

2. The mail system <>: host[] said: 554 Message not allowed – [320] (in reply to end of DATA command)

Solution: This email is rejected because the sending machine’s time settings may be incorrect. To resolve the issue:

• Double-click the time on the bottom-right corner of the computer screen.
• Select correct day, month and time.
• Click OK after correcting date and time.
• Now you are set to send and receive YahooMails.

3.. Error “554 5.7.9: Message not accepted for policy reasons” when sending an email to Yahoo.

Solution: This message wasn’t delivered because Yahoo was unable to verify that it came from a legitimate email sender. This email failed one or more authentication checks that Yahoo uses to verify emails. So, the best solution to this problem would be avoiding looking like a spammer by following some of the simple tips and practices:

• Perform mailing list management frequently.
• Send emails only to those who want it.
• Review your email content, don’t include HTML forms, JavaScript or embedded objects (like Flash or ActiveX).
• Secure your email servers.
• It is good if your email includes DKIM Authenticated Signatures.

4. Error 554 Invalid recipient

Solution: This error occurred and the email was bounced back because a mail was trying to be sent to an account that didn’t exist. So, the best practice is to always check the email address before sending and maintain and check your mailing list.

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