Connection rejected due to installation settings

Eudora 6.2.3.4, paid mode.  Windows 2000, kept patched up-to-date.

For some time now, I've been receiving bounce messages from a certain
address

   ----- The following addresses had permanent fatal errors -----
< XXXX@XXXXX.COM >
    (reason: 553 Connection rejected due to installation settings of
receiving SMTP host)

While this "blames" the SMTP server, I'm told by the recipient's
sysadmin that the fault is mine, because the translation from domain
name to IP address is being held in "cache" somewhere in my computer,
and the cached value is incorrect.  Schafercorp.com was given a new IP
address due to a change in ISP.  I agree with this assessment, because
if I install a brand new instance of Eudora on a different machine
(but connected to the same router / home network), there is no
problem.

Where is this "cache" to be found and how cleared?  Simply clearing
the address from history.lst and from my address book and then
re-entering it later doesn't seem to fix things.

A clean reinstallation on my machine would be a disaster.  There are
just too many mailboxes and settings to re-create everything from
scratch unless it had been totally trashed.

Many thanks,

Fred Holmes

The translation from the server name to an IP address is handled by the
DNS of your ISP.  So far as I know, it is not cached on your computer.
But you can force the use of some other ISP's DNS.  You can do that by
clicking
Start|Setting|ControlPanel|NetworkConnections
Then right click on the connection you are using (it might be Local
Area Connection 1, for example) and select properties.  In the window,
scroll down to TCP/IP and select properties.  Select Use the Following
DNS Server Addresses and enter 68.48.0.12 and 198.6.1.125.  Click OK
several times to get out.

How did you pick those two specific DNS servers?  Is there a list of
publicly-accessible DNS servers somewhere?  If I try to do a reverse
lookup of the IP addresses you have provided below, I don't seem to
get anything.

Thanks,

Fred Holmes

I have a list of known good DNS servers.  Those are just two from my
list. I'm not aware of any public list of DNS servers.

Routers can cache DNS information though. 


Generally, it is desirable to choose the setting for letting Windows 
obtain the DNS server adddresses from the server when you connect to the 
internet. That eliminates the need to make changes to reflect changes at 
your ISP. If your ISP is telling Windows to use a bad DNS server, setting 
it to use a specific server can be helpful, but that's not usually a 
problem. (There are other reasons you might want to use a different 
server, but they don't apply to the average user either.) 

-- 
Katrina

In general I agree.  But if there is something caching the DNS
information, changing DNS servers could flush the cache.

While routers can cache DNS information, that wouldn't seem to be the
case in my circumstances.  A fresh installation of Eudora on a second
computer (with no prior installation of Eudora or other e-mail, but
lots of other stuff installed) connected to another port on the router
works fine.  If the bad information were in the router's cache, then
both computers/instances of Eudora would see it, I would think.

Fred Holmes

Thus spake Fred Holmes < XXXX@XXXXX.COM > :


Are you using the same SMTP server?  This seems to be a problem at the
ISP level and not yours.
-- 
dillon

Could have been is in the past
Could be is in the future
There is only the now

I would think so too. 

Are you using any kind of proxy server on the computer with a problem? If 
so, I suppose that could conceivably be doing some kind of DNS caching, 
but I fail to see what it could be caching that would cause this.

Where are the bounce messages coming from - the SMTP server you're using 
or the recipient's server? 

I'm not sure I believe the explanation for the problem that you've been 
given. I really don't see how a dns cache on your computer would result in 
claims that the SMTP server's settings are wrong. If the wrong address for 
the server were cached, then message wouldn't be getting to the server to 
begin with and thus you wouldn't be getting bounce messages. If the SMTP 
server is getting incorrect DNS information about the recipient's server, 
that could certainly result in it sending you bounce messages though. It 
is hard to say whether that would result in the error you're seeing 
though. Different servers generate different error messages. If the DNS 
information that the server is getting is old and incorrect, the problem 
should apply to all computers though, not just one. Are you sure the 
settings are exactly the same on the two computers?  What happens if you 
copy eudora.ini from the computer where it works to the computer that has 
the problem? Does that fix the problem? 

-- 
Katrina

Fred, when you open a DOS box and ping www.shafercorp.com from the two
different computers, does it resolve to the same IP address or
different IP addresses?

On the computer with the problem, if you replace shafercorp.com in the
email address with the numerical IP address , does the mail get sent
properly?

Do you have a hosts file with the wrong address in it?
Look for the file \windows\system32\drivers\etc\hosts and look for a 
schafercorp.com entry; if it's there, delete it.

Note: hope you're using schafercorp.com, NOT shafercorp.com. The latter 
is a valid domain but will not accept mail (mx is set to 'localhost').
	-Rick

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Yes, the same SMTP server in both instances.  The "properties" of the
"personality" are set to the same values in each instance of Eudora.

The one I want to use has the problem; a second instance of Eudora
installed on another computer hitched to the same router/switch works.
Of course, the same cable modem.  The "name" of each computer is
different, of course.

Fred Holmes

On Tue, 21 Mar 2006 22:06:32 -0600, Dillon Pyron

I get the same result pinging from either machine.
www.schafercorp.com returns 12.105.77.212.

I'm not sure how to use the IP address in an e-mail address.  I sent
the message to  XXXX@XXXXX.COM  and it bounced with a "host
unknown" error message.  

Of course 12.105.77.212 equates to www.schafercorp.com, and the www is
not used in the e-mail address.  What is the correct way to do that?

Thanks,

Fred Holmes

Yes, I'm using schafercorp.com.  (Dunno who shafercorp.com is.  Sorry
for the typo.)  schafercorp.com is not contained in my hosts file.

Thanks,

Fred Holmes

On Tue, 28 Mar 2006 08:48:09 -0500, Rick Murphy