The mysterious ways of Python mailing list

[Skip Montanaro]

Some of my messages take about an hour. From looking at the headers in
these cases, it looks like the delay is always before the message is
received (i.e., accepted) by mail.python.org. This looks like greylisting.


Yes, greylisting is one of the anti-spam arrows in the wider on
mail.python.org. However, once your email address has passed that
threshold, new messages from the same address should float through without
delay.

If you have one such message and have the ability to save the entire
original message and all headers to a file (i.e., not Outlook),  you might
want to send it to postmaster at python.org for one of the smart folks there
to investigate.

Skip