Delivery to the following recipients failed
Problem reported by Khan Tran - 10/15/2014 at 11:19 AM
I've received the following error when trying to test sending email back to myself. Please help!!!

This is an automatically generated Delivery Status Notification.


Delivery to the following recipients failed.




Reporting-MTA: dns;

Received-From-MTA: dns;

Arrival-Date: Wed, 15 Oct 2014 11:11:56 -0700


Original-Recipient: rfc822;

Final-Recipient: rfc822;

Action: failed

Status: 5.4.4

3 Replies

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Joe Wolf Replied
It looks good to me:
MX record about exists.
Connection succeeded to SMTP.
220 ESMTP Postfix


=250 2.1.0 Ok

> RCPT TO: <>
=250 2.1.5 Ok
Bruce Barnes Replied
5.4.4 is FAILURE TO ROUTE - it's a PERMANENT ERROR and will fail delivery.
The recipient's MX server may have had DNS issues at the time and could not be found.
See: E-Mail Delivery Error Codes to learn more about non-delivery.
Bruce Barnes
ChicagoNetTech Inc

Phonr: (773) 491-9019
Phone: (224) 444-0169

E-Mail and DNS Security Specialist
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Choong Chong Yew Replied
I got this when sending using SmarterMail but using Yahoo Mail, it's delivered successfully and even got a response from the recipient. What could be the issue?
Original-Recipient: rfc822Failed Recipient:
Final-Recipient: rfc822Failed Recipient:
Action: failed
Status: 5.1.1
Diagnostic-Code: smtpCould not deliver message to the following recipient(s):
 Failed Recipient:
 Reason: Remote host said: 550 Requested action not taken: mailbox unavailable
 invalid DNS MX or A/AAAA resource record

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