Frosty said:
Recently, my Outlook 2003 started returning email as "Undeliverable" due to
Spam List.
It does not matter is I have attachments or not.
I have not changed my settings and it was sending fine just a week ago.
Two questions, I'm hoping this forum can help me with, What caused it, and
how do I get it corrected?
Thanks,
Frosty
Below is the message:
Your message did not reach some or all of the intended recipients.
Subject: Handle Ready
Sent: 4/22/2008 8:27 PM
The following recipient(s) could not be reached:
(e-mail address removed) on 4/22/2008 8:27 PM
550 Denied due to spam list
Can't tell you without knowing your IP address. Then it could be
checked on the public blacklists to see if it was listed. If the
receiving mail provider uses their own private blacklist, no one but
them can check to find out why your IP address (or that for your
outbound mail host) got listed.
Run 'ipconfig /all' in a DOS shell. Did your IP address change
recently? It is likely you have a dynamically assigned IP address.
That means they expire, usually after something like 1 to 3 days. Even
if expired, you get to keep them until you drop your network session
with your ISP (i.e., you reboot or power off). Then you become eligible
to get a new IP address. You might get the same one you had before (if
you have an always-on DSL or cable connection) or you might get a new
one (despite whatever connection type you have). When you get assigned
a new IP address, it might've been one that had been previously abused
by some infected user running a mailer trojan or by a spamming user.
Now you have that IP address and are getting blacklisted for their
abuse.
Most public blacklists will expire their records in 1 to 3 days. So it
depends on which public blacklist you are listed as to how long before
you are no longer blacklisted (as long as no more spam hits their traps
or no user re-reports you for sending spam). So wait it out for a
couple days, or start searching for public DNSBLs (DNS blacklists) and
check if your IP address. If you use a NAT router, it would be the
WAN-side IP address of your router (since that is what external hosts
see when you connect to them).
Some blacklists are very nasty in that they rate the spamminess of a
domain, not of a particular sender. They are intended to be used in
scoring schemes where the spamminess of a site will add some weight to
e-mails delivered from there but not by themself indicate that a
particular message is spam or not. Unfortunately that is not how some
users or e-mail providers use those blacklists and instead use them as
0%/100% (good/bad) measures of e-mails.
You sent an e-mail to someone at Yahoo. Yahoo doesn't like the IP
address of your or your outbound mail host. I doubt Yahoo is going to
tell you which blacklist they employ and they may even use their own
fabricated blacklist based on their own criteria and algorithms. I
don't know your IP address so I can't go searching the public blacklists
to see if you are listed there. You could call your own ISP and ask
them to see if you are in a public blacklist. Or you could try to
renegotiate with their DHCP server to see if you can get a new IP
address (how to do that depends on your hardware/network setup).
