Can't find, remove or delete defective/bad email address

Not open for further replies.


Using Windows XP Pro (SP3) and Office XP Pro (Outlook 2002)

My problem is that a "non-existent" bad email address replaces my client's correct email address in the transmission process whenever I send the client an email with its correct address and because of the "non-existent" bad email address, my email is returned with an error message. (the error message states that the error is "550" and that the correct email address is expanded to the incorrect or "non-existent" email address which turns out to be a "user unknown" at Here's what the error message states:

----- The following addresses had permanent fatal errors
(reason: 550 unknown)
(expanded from: <>)

The "" is the bad address; the "" is the correct address.

I know about the .nk2 cache in Outlook 2002 and I have deleted the .nk2 file several times, but to no avail. (By the way, the "non-existent" bad email address is not in Outlook or on my PC anywhere and it does not appear when I type the client's email, that is, it is not evident from any autocomplete function; also, if I try typing the "non-existent" bad email address in the "To:" field of a new email, there is no recognition of the "non-existent" bad email address by Outlook. So, this apparently is NOT an autocomplete remainder email address, but a "non-existent" bad email address that is somehow stored in Outlook's files somewhere and used as the primary email address for my client's correct email address.

No matter what, I am simply unable to transmit an email to my client using its correct email address because the correct address keeps being converted to the bad email address.

Is there any other way to clear, correct, or remove the "non-existent" bad email address?
This part (edited for security reasons):

----- The following addresses had permanent fatal errors -----

(reason: 550 unknown)

(expanded from: <>)

Looks to me like the mail is being forwarded/redirected to the mindspring address by the server and the mindspring address is not correct.

The problem is not with your outlook, its with the recipients server configuration.
The reason I don't think it is at the recipient's end or at Mindspring/Earthlink is because I have a second computer configured exactly the same as the first one and when I send an email to my client with the second computer using the correct email address the email goes through and does not cause any error message or a redirection to a bad or unrecognized email address. If the problem was with the recipient's domain or server or if the problem was with Earthlink/mindspring it would seem likely that the problem would occur regardless of which computer I used. Because my client receives the emails I send with the second computer but not with the first I concluded that the issue has to do with my first computer and a bad email address that can't find or get rid of.
I also wanted to say that I am really baffled about being able to send emails with the correct address from each computer to my client and one is rejected and the other is not, although they appear to be exactly the same emails.

How can I find and remove the unknown user email? Or if it is a problem at the recipient's end why is the second computer email going through with the same email address that is rejected when sent with the first computer?
The bounce message indicates its the mail server is changing the address.

So its only happening on one computer? Does that computer use the same account and smtp server as the others? What antivirus do you use on that computer?
Yes all the way around. Both computers have Outlook using the same account with my earthlike domain hosting account. Smtp are set the same. Same norton 360 antivirus on both. They really are mirrors of each other. But really only happening on just one computer.
I'm stumped - unless the host file on the one computer is redirecting the smtp to the wrong server.
Not open for further replies.
Similar threads
Thread starter Title Forum Replies Date
S Related messages show in main Outlook window vice new Advanced Find windows Using Outlook 1
mrrobski68 Issue with Find messages in a conversation macro Outlook VBA and Custom Forms 1
O How to find out the domain and server settings that my Outlook is using? Using Outlook 2
T How to find or display the sub-folder name for an Archive Search Using Outlook 10
Bardiferous Weird Contacts Behavior - Can't find any in any address book, but they're in there Using Outlook 3
J search doesn't find anything Using Outlook 1
M Issues with templates - unable to find in old web app Using Outlook 3
O How to find and replace a word in Outlook-Agenda-Subject and Message? Using Outlook 0
B Search and Find Email by Folder Name Outlook VBA and Custom Forms 2
Witzker How to find all emails from and to a contact in OL 2019 Using Outlook 6
S How to find emails that I sent that have not received a reply? Using Outlook 7
K Use VBA to find Sender and Recipient from Microsfot 365 Journaled Email Items Outlook VBA and Custom Forms 3
M How can we find the list of users who are members of a deleted distribution list? Exchange Server Administration 2
N Disable Auto Read Receipts sent after using Advanced Find Using Outlook 4
H Outlook 2003 find by "has attachment" Using Outlook 1
geoffnoakes Find Contacts with UDFs "in this item" Using Outlook 1
L Moving emails with similar subject and find the timings between the emails using outlook VBA macro Outlook VBA and Custom Forms 1
B Outlook 2010 Can not find a certain file in M/S Outlook 2010. Using Outlook 1
T "cannot find the calendar folder for this item" - calendar items stuck in outbox Using Outlook 0
S Find a cell value in excel using outlook vba Using Outlook 1
B Looking to filter (or just find/search) for only messages that the sender has sent more than 1 messa Using Outlook 2
B Search: Cannot find which Folder Contains a Message Using Outlook 3
K How to find specific header and copy the mail body Using Outlook 0
Hudas VBA find and open an email without looping thru each email in the inbox Outlook VBA and Custom Forms 1
E How to find or recover Lost e-mails within a folder under Inbox? Using Outlook 2
H "Advanced find: column for full folder path? Using Outlook 1
M What is the best way to find all records of an e-mail for our company? Outlook VBA and Custom Forms 2
C Find all deleted recurrence appointments Outlook VBA and Custom Forms 4
mrje1 Is there a Find and Replace feature in Outlook 2016? Using Outlook 4
G Can't find contacts entered Using Outlook 0
Connie Boyer Exporting Outlook calendar/find next repeating meeting Using Outlook 3
B Find related messages to sender Outlook VBA and Custom Forms 7
B Find Related Emails to sender Using Outlook 1
RBLampert Outlook "can't find" my e-mail server to receive messages Using Outlook 22
M Can't find messages Using Outlook 4
Diane Poremsky Find the Distribution Lists a Contact Belongs to Using Outlook 0
T Macro to find contacts by category and copy them to another folder Outlook VBA and Custom Forms 15
thomas zaleski Cannot find the Sending FOlder Using Outlook 2
J Find and Highlight text in outlook Outlook VBA and Custom Forms 4
J Outlook Mailbox cleanup; any way to change limit to find items older 999 days? Exchange Server Administration 2
F Disable "Find related messages" Using Outlook 1
Jennifer Murphy Can't delete or even find task attachment Using Outlook 1
K Re: Use Instant search to find messages from a contact Outlook VBA and Custom Forms 6
Andrew Hawkins "Advanced Find" Using Outlook 1
M BCM 2007 Can't find SS2012Express Using Outlook 2
O Outlook 2013 contacts - Where to find "Display as"-field Using Outlook 2
A Advanced find query facilty Help please Using Outlook 2
C Cant find emails after moving pst Using Outlook 1
G Find Organizer of appointment Using Outlook 2
R writing "Instant Search" queries to find User-Defined fields Using Outlook 0

Similar threads