On Fri, 21 May 2021 20:28:23 -0400, Nelson Pardee <[log in to unmask]>
wrote:

> Last error: 5.7.1 550-5.7.1 [67.231.157.15 12] Our system has
>                            detected that this message is

Obviously the message is over long and has been cut off.  My guess is the
actual whole message if you could read it would be along the lines of
another:

> Last error: 5.7.1 554 5.7.1 [VI-1] Message blocked due to spam
>                            content in the message.

It doen't really matter what the message text is, LISTSERV takes action
based on the error code numbers.  

>Last error: 5.7.1 550-5.7.1

There are 2 different systems of codes. Your error message uses both code
systems, which is common these days.

SMTP codes from RFC 821, 2821, 5321

550  Requested action not taken: mailbox unavailable (e.g., mailbox
      not found, no access, or command rejected for policy reasons)

Delivery Status Notification (DSN) codes from RFC 1893, 3463

5.7.1   Delivery not authorized, message refused.  The sender is not   
        authorized to send to the destination.  
        This is a policy or security code.

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