Delivery Failures


Error Message:

Your message

To: address@domain.com
Subject: {Subject Title}
Sent: {Date] {Time} {Time Zone}

did not reach the following recipient(s):

Variation 1:
address@domain.com on {Date] {Time} {Time Zone}
The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.
<{Issuing Server} #5.1.1 smtp;550 5.1.1 <address@domain.com>... User unknown>

Or:

<{Issuing Server} #5.1.1 smtp;550 5.1.1 <address@domain.com> User unknown; rejecting>

Variation 2:
The message was undeliverable because the recipient specified has changed address permanently and forwarding was not applicable
<{Issuing Server} #5.1.6 smtp;550 5.1.6 Recipient no longer on server: address@domain.com>

Variation 3:
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<{Issuing Server} #5.5.0 smtp;550 <address@domain.com>: Recipient address rejected: User unknown in relay recipient table>

Or

<{Issuing Server} #5.5.0 smtp;550 Invalid recipient: <address@domain.com>>

<{Issuing Server} #5.5.0 smtp;550 address@domain.com is not a valid user>

<{Issuing Server} #5.5.0 smtp;550 Administrative prohibition - unable to validate recipient>

Variation 4:
address@domain.com on Thu, 8 Sep 2005 14:53:45 +0100
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<{Issuing Server} #5.5.0 smtp;554 delivery error: dd This user doesn't have a domain.com account (address@domain.com) [-5] - {Server Name}>
 


Explanation:
This non-delivery report provides the relevant information about the email and the error which has occurred.  The {Issuing Server} is not always the server that the error has occurred at but rather the server that issued the error message to the 'Sender'.

Variation 1, 3 & 4:
The phrase "The e-mail account does not exist at the organization this message was sent to.", "Recipient address rejected" and "This user doesn't have a domain.com account" indicate the cause.  The errors are self explanatory, the email recipient "address" does not exist at the stated domain "@domain.com".

Variation 2:
The phrase "Recipient no longer on server." indicates the cause.  The error is self explanatory, the email recipient account "address" used to be on the server however has since been closed.
 


Conclusion & Action Required:
The sender should ensure that the email address is correctly typed.  If email address is correctly spelt, then the sender should contact the recipient to enquire as to whether the email address has changed or if their service provider's server have a fault.

The recipient should contact their service provider to enquire as to the cause of the error, or provide the sender with the correctly spelt email address.
 


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