Undeliverable: Re: sh[it] and What am I missing here?

Valeri Galtsev galtsev at kicp.uchicago.edu
Mon Jun 6 03:04:26 UTC 2016

On Sun, June 5, 2016 8:40 pm, Jon Radel wrote:
> On 6/5/16 9:37 PM, jd1008 wrote:
>> If the fake user is at the server in question, that server replies to
>> the list with a spam.
> Actually, in this case it appears that the "fake" bounce messages are
> sent to the sender, not the list.
> I suspect I'm about to find out.  Unless, of course, my spam filters are
> up to snuff.

>From all what you guys said it sounds like something on this mail list is
harvesting poster's e-mail addresses, and then [likely different server]
sends each of the posters this sort of spam directly. There is virtually
no way to catch the harvester. As far as the server that spam comes from
is concerned, all we can do is to block it on the side of our own servers.
I will likely to find out more detail, namely the IP that delivered these
messages after my post comes through and I receive my personal spam
message. Once I get that myself, then I will block them on the side of my
servers. It doesn't matter for me whether it is just rogue server, or some
brain dead "sysadmin" poorly configured his server, which is just sending
so called "backscatter". Either way, the box will be blocked without

Sorry about adding to background nose ;-(


PS Some people prevent this sort of abuse by doing the following. They
create aliases for each mail list they subscribe to, and then, whatever
comes to that alias is being thrown away, except for mail coming through
that particular mail list. You should be careful and always post From
particular alias...

Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247

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