On 2/19/2024 11:55 AM, Skip Montanaro wrote:
    Here is a typical bounce message that I get:

    <python-list@python.org <mailto:python-list@python.org>>: host
    mail.python.org <http://mail.python.org>[188.166.95.178] said:
    450-4.3.2
          Service currently unavailable 450 4.3.2

Some time after I get one of these messages I re-send the post. Usually
    it gets through then.


Looks kinda like greylisting to me. I'm pretty sure that's one of the tool in the mail.python.org <http://mail.python.org> chain.

I don't see it as greylisting. A repeat post will succeed, before there would be time for my email provider (Dreamhost) to do anything about it.

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