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A client recently switched to Exchange Server / Outlook for their email. Since then emails from my company to any email address at their company bounce back from the System Administrator with this error:

  Your message did not reach some or all of the intended recipients.

   Subject:  Email Solution
   Sent: 12/12/2012 11:08 AM

   The following recipient(s) cannot be reached:

   'name@client.org' on 12/12/2012 11:08 AM
    550 5.1.1 <name@client.org> recipient rejected

Looking in the Message Options of the bounce back email shows no data in the Internet Header field.

My client's IT guy says we're not being blocked, but I cant think of any other reason the bounce would occur.

Any suggestions on what questions to ask or how to fix this would be helpful.

I'm using a desktop version of Outlook 2007 and connecting through my ISP.

Thanks.

Stan
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4 Answers4

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550 5.1.1 means that the recipient email server believes that the email address does not exist at the destination domain, and therefore has no way to deliver it.

Unless you simply made a typo in the email address, this is not something that you can fix, and must be addressed at the other end.

Michael Hampton
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2

A Spam filter may also be the cause if emails are passing through it and the email address is not registered on it as yet

Jabulani Sibeko
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1

Tell the IT guy to add the following records to their domain DNS Zone file supposing that their domain is client.org:

A record

Host: mail

Points to: [put here the ip address of client.org without brakets]

MX record

Priority: 0

Host: @

Points To: mail.client.org

Shadi Alnamrouti
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0

The issue came up when i tried to email to any email address. Even ones that i could email using other servers.

I had this issue arise after upgrading from Ubuntu 14.04 to 16.04. I have Virtualmin and postfix involved. I compared my old /etc/postfix/main.cf with the new one and noticed some changes.

The fix for me was to comment out "default_transport = error" in /etc/postfix/main.cf and then to restart postfix.

File: /etc/postfix/main.cf Line to comment out: default_transport = error

Comment out the line by adding a # to the start of it.

Restart postfix with... sudo /etc/init.d/postfix restart

xriri
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