So now that I can classify IP addresses by ASN,
I thought I might see how it could help with spam email.
I'm already using an ansi-spam agent to cut down on spam,
so maybe filtering by ASN could cut down even more.
The last time I looked into additional means of spam avoidance,
the use of SPF wasn't worth the effort.
And I'm afraid the effort of blocking via ASN won't be worth the effort either.
Looking over email attempts over the past month,
the top 10 networks who sent email to my server,
from 5,181 individual emails:
Top 10 emailers to my server
| AS | Count |
|---|
| IOMART-AS, | 375 |
| IDNIC-IDCLOUDHOST-AS-ID | 369 |
| PAIR-NETWORKS, | 263 |
| MICROSOFT-CORP-MSN-AS-BLOCK, | 246 |
| AS-COLOCROSSING, | 152 |
| EMERALD-ONION, | 124 |
| GOOGLE, | 122 |
| SPARKPOST, | 120 |
| TZULO, | 112 |
| AMAZON-02, | 106 |
Unlike the web
(or even Gemini or gopher)
there isn't one dominant network here—it's all spread out.
I don't think it's really worth the effort to block via ASN for spam.
At least for my email server.
You have my permission to link freely to any entry here. Go
ahead, I won't bite. I promise.
The dates are the permanent links to that day's entries (or
entry, if there is only one entry). The titles are the permanent
links to that entry only. The format for the links are
simple: Start with the base link for this site: https://boston.conman.org/, then add the date you are
interested in, say 2000/08/01,
so that would make the final URL:
https://boston.conman.org/2000/08/01
You can also specify the entire month by leaving off the day
portion. You can even select an arbitrary portion of time.
You may also note subtle shading of the links and that's
intentional: the “closer” the link is (relative to the
page) the “brighter” it appears. It's an experiment in
using color shading to denote the distance a link is from here. If
you don't notice it, don't worry; it's not all that
important.
It is assumed that every brand name, slogan, corporate name,
symbol, design element, et cetera mentioned in these pages is a
protected and/or trademarked entity, the sole property of its
owner(s), and acknowledgement of this status is implied.
