What's going on it very odd, and I'm seeing some possibly related problems
in another context.
The person experiencing this problem is our new list co-owner, a completely
legitimate person. She just got an email from her alma mater as an alumnus;
these emails are setup and managed by google in the alumni.usc.edu domain.
She recently received, for example, an email from someone having a gmail
address with the message "Gmail could not verify that it actually came from
[log in to unmask]". In fact, the sender has sent her dozens of emails- there is
nothing fake or phony about the email. I infer that the spam filters on the
alumni.usc.edu domain are overly aggressive and/or wrongly configured

The additional situation I'm referring to related to my Toastmasters club.
When I personally  send email through the club website to the list of our
members, the people in the club with Syracuse University email addresses
have my emails routed to their junk folders. Their email system is an
exchange system, although I'm not sure whether they are managing it or MS is
hosting the email for them. When I send emails to these people directly from
my account, they get through with no trouble.

I am inferring in both cases there may be problems with spam filters on
these enterprise systems. It also seems to coincide with gmail reporting
higher volumes of spam on my personal email, although the classification is
pretty accurate- I'm not seeing a lot more junk getting through nor a lot
more legit emails classified as spam. Maybe the spam filters are being
tweaked due to higher volumes? I realize this isn't a Listserv problem per
se, but it does affect our ability to use Listserv.

Am I making any sense? You folks are much more knowledgeable about email
than I am.

Nelson

-----Original Message-----
From: LISTSERV List Owners' Forum <[log in to unmask]> On Behalf
Of Ben Parker
Sent: Friday, May 21, 2021 20:46
To: [log in to unmask]
Subject: Re: Odd Error message

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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