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One user, suddenly getting email bounce backs from a specific .com

I have the owner of a company suddenly getting returned mail whenever sending to a specific .com

Other users in the office are sending to the this .com fine and are using the same settings as the owner.

He can send and recieve fine to and from everyone else.

I thought at first, perhaps his smtp settings needed to be adjusted and did so, however, this did not fix his issue. He is using Windows Live Mail, POP3 settings.

This is the bounceback info I get after changing his smtp to his local ISP smtp settings:

Reporting-MTA: dns; mta11.charter.net
Arrival-Date: Thu, 24 May 2012 11:57:48 -0400
Received-From-MTA: dns; imp09 (

Final-Recipient: RFC822; <user1@domain.com>
Action: failed
Status: 5.3.0
Remote-MTA: dns; domain.com.inbound10.mxlogic.net (
Diagnostic-Code: smtp; 554 Denied [c7a5ebf4.0.34734.00-2353.58856.p01c11m116.mxlogic.net] (Mode: normal)

Final-Recipient: RFC822; <user2@domain.com>
Action: failed
Status: 5.3.0
Remote-MTA: dns; domain.com.inbound10.mxlogic.net (
Diagnostic-Code: smtp; 554 Denied [c7a5ebf4.0.34734.00-2353.58856.p01c11m116.mxlogic.net] (Mode: normal)


This Message was undeliverable due to the following reason:

Your message was not delivered because the destination computer refused to accept it (the error message is reproduced below).  This type of error is usually due to a mis-configured account or mail delivery system on the destination computer; however, it could be caused by your message since some mail systems refuse messages with invalid header information, or if they are too large.

Your message was rejected by
domain.com.inbound10.mxlogic.net for the following reason:

     Denied [c7a5ebf4.0.34734.00-2353.58856.p01c11m116.mxlogic.net] (Mode:

The following recipients did not receive this message:

Windows Live Mail

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Last Comment

8/22/2022 - Mon

Almost sounds like the receiving mail server has a manual setting to reject mail from this sender. Could also be related to the content of the email that's being sent - it's too large, or has a disallowed attachment file type - but I expect you've tested with a plain old test mail.

Only other thing I can think is if the sender's email address contains non-standard characters that are recognized by the sending mail system, but not by the receiving mail system. That wouldn't explain why this started suddenly, though.

Can you verify that other senders can successfully send mail to user1@domain.com and user2@domain.com? Maybe those addresses are no longer valid at the destination, and the destination mail server is (correctly) not responding with a specific "invalid address" NDR?

I have tested with a plain empty message with the same result. The user1 and user2 emails he is attempting to send to are indeed valid.

As far as I can tell from a few tests/searches online it is not an IP Blacklist issue, though, that would affect the other senders in his office as well.

Unless there is another avenue to explore, im stumped. I have already instructed the recipients to contact there mail host to verify if the individual email is being blocked for some reason.

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I have to agree this clearly looks like an issue of his email being filtered out or blocked altogether. I made the .com aware everything is fine on his end and like it or not they will just have to investigate who and or how they have him blocked on theirs. Appreciate the help!
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