Hi,

My mailman3.auth_users table contains 131 rows, of which 113 of them
were created in the last week. All of these users have a 10 character
long random string of lowercase letters as their chosen username. Their
email addresses are all over the place.

I only noticed this was happening because an unusual number of the
subscription confirmation messages were bouncing back to me as
postmaster, and I saw the unlikely user names.

I matched up some of the date_joined timings with logs of HTTP POST to
/mailman/accounts/signup and every single one so far was a unique IP
address. So I am not going to get very far with firewalling.

Does anyone have any suggestions what I can do to avoid this?
Specifically what I would like to avoid is sending a confirmation email
to these potentially innocent addresses.

…

Hmm, actually I've just noticed that all of them are Tor exit nodes.

Looks like I could probably autogenerate an Apache ACL that lists all
Tor exit nodes and bans them from posting to /mailman/accounts/signup.

Thanks,
Andy
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