Member Avatar for minbor
minbor 0 Newbie Poster

Hello,
I have a problem with one account in MS Exchange. All other accounts are ok, but whenever you try to send external email to this acount a reply like this comes back:

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.


Final-Recipient: rfc822;
Action: failed
Status: 5.4.6
X-Display-Name: User Name

If anyone knows about this issue please let me know. I've searched the net, MS knowledge base ans exchange help files, but no luck finding any solutions.

Please help

minbor

  • 1 Contributor
  • 0 Replies
  • 105 Views

Dani AI

Generated

As described, only one mailbox is generating an NDR with status 5.4.6 while all other accounts accept external mail. When a single recipient is affected the problem is very often in the recipient object, its SMTP addresses/forwarding, or how Exchange routes mail for that address. The following focused checks usually find and fix the issue.

Run quick recipient checks in the Exchange shell to confirm the object and its addresses/forwarding are correct:

Get-Recipient "address@mydomain.com"
Get-Mailbox -Identity "User Name" | Format-List PrimarySmtpAddress,EmailAddresses,ForwardingAddress,DeliverToMailboxAndForward,RecipientTypeDetails

If the recipient is a mail-enabled contact or has been migrated, verify the proxyAddresses/EmailAddresses attribute in AD (use ADUC Attribute Editor or the Exchange cmdlets) and ensure that address is not duplicated on another object. Also confirm the mailbox is enabled and mounted on its mailbox database.

Use message-tracking and transport logs to see how Exchange processed the inbound messages and why delivery failed:

Get-MessageTrackingLog -Recipients "address@mydomain.com" -Start (Get-Date).AddDays(-1) -End (Get-Date)

Look for RECEIVE -> ROUTE/SEND/FAIL events and any transport-agent or connector errors. Check the Hub/Edge Transport queue viewer for stuck messages and the Application event log for MSExchangeTransport errors around the same time.

Common fixes found after those checks

  • Remove duplicate proxyAddresses or correct which object owns the address.
  • Disable/clear incorrect forwarding or ExternalEmailAddress settings.
  • Re-enable or reconnect a disconnected mailbox, or update routing after a mailbox move.
  • Correct connector/accepted-domain configuration if the address is being routed externally by mistake.

Caution: change AD/Exchange attributes only during maintenance windows and, when possible, after exporting current attribute values. After each change re-run the message-tracking test to confirm delivery.

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.