From: . kibble . (jelly_bean_junkyhotmail.com)
Date: Mon Dec 20 2004 - 03:54:13 CST

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It's not always about static IPs, you have public and private assigned IP's
from your ISP. Most of the time a reverse DNS lookup on your IP will reveal
your ISP details. I think they [I mean their MTA] look at that, and a simple
match from a list of known ISP's [i.e BT or Wanadoo in the UK, AOL and
likewise else where in the world...] and they will automatically block that
email.

It sucks when you want to run your own DNS & mail server as I've found
out... I used to have a static BT IP, but that didn't work and had a few
complaints when people tried sending emails out to AOL users and got their
emails returned. I changed my ISP and I have no problems sending emails to
any other providers.

My advice is do what I did, contact the Internet providers you are thinking
of going with, ask if you can host DNS and SMTP services without
restrictions. I know some ISP's here in the UK will allow you to host a SMTP
service, but once you have your DSL line activated, you have to request that
they unblock your port 25.

Hope this info is of some help to you...

----Original Message Follows----
From: Brian Richardson <briancubik.ca>
To: dfeustelmindspring.com
CC: miscopenbsd.org
Subject: Re: spam pattern
Date: Sun, 19 Dec 2004 15:25:45 -0700

Dave Feustel wrote:
>I've tried using sendmail to send mail to mindspring and verizon email
>addresses. The mail was rejected by both ISPs because it came from a
>dynamically assigned address(mine). Makes getting a
>static address worth looking into.

Dunno. I've got a static address and I still send my mail upstream to my
ISP. Can't malicious people have your address blacklisted? It'd probably be
easier to report one of the leaf nodes of a DSL provider as a spammer than
the ISP itself. At any rate, how else did my last IP address end up in SORBS
(it was dynamic, mind you, but I was the only one to use it for somewhere
around 3 months)?

Brian

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