The error listed reflects an invalid character in the 'sender' address.

To simplify a web search, use 550 5.1.0 bounceback code, as that's what the actual code is in the message.

It's not clear whether the [ and ] brackets are incorrectly listed in the sender address, but, as we all know, those shouldn't be there.

We have had instances where list email addresses were uploaded from .csv file converted to .txt and the .csv table specifications added special characters within the .txt file, generating similar bouncebacks. The addresses needed to be manually removed and then re-added to correct the issue.

Regards,

Suzi

From: LISTSERV Site Administrators' Forum <[log in to unmask]> on behalf of Smith, Dennis P (IHS/HQ) [C] <[log in to unmask]>
Sent: Thursday, May 18, 2017 10:36:01 AM
To: [log in to unmask]
Subject: Troubleshooting Probe Failures

I seem to be stuck between mail administrators pointing their fingers at each other for the issue of these probe failures. I just do not know how I can get to the bottom of this issue and get it resolved. I cannot determine if it is the mail server or the content filtering devices.

The error is as follows:
        The reason for the problem:
        5.1.0 - Unknown address error 550-'REJECTED - Invalid characters in sender =
        email address [@]'

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