Need some SMTP troubleshooting help - Please!.

[Charles Jones]

There is also this:   
http://help.yahoo.com/l/us/yahoo/mail/postmaster/postmaster-26.html


    553 Mail from x.x.x.x not allowed

Open proxies <http://cc.uoregon.edu/cnews/fall2002/openproxy.html> and 
open relays <http://www.mail-abuse.com/an_sec3rdparty.html> are a very 
common source of spam. Yahoo! uses a variety of techniques to detect 
these, and Yahoo! does not accept SMTP connections from either open 
relays or open proxies. Your connection may be rejected because the 
email server that you use for sending email is probably an "open relay" 
or "open proxy." These types of email servers can easily be tricked into 
sending large amounts of unsolicited email.

Many email services refuse mail from such servers, until the server has 
been fixed to stop relaying spam to innocent users.

To correct this problem, you should contact the system administrator of 
your mail server (usually "postmaster at your-domain.com") and forward them 
a copy of the bounced email you received. Otherwise, you should call 
technical support and alert them of the problem.

You can check <http://www.robtex.com/rbls.html> to see if your mail 
server is listed on several of the public open relay DNSBLs. Please note 
that if your server is not listed at this link, it may still be an open 
proxy or open relay. Abuse.net provides a web-based open relay test 
<http://www.abuse.net/relay.html>. Instructions to close open relays are 
readily available on the Internet.

Testing triggers

To determine whether an IP address is an open relay or open proxy, a 
series of tests need to be performed on that IP address. Yahoo! actively 
performs tests for open relays and open proxies but only after that IP 
address has been identified as a source of significant suspicious 
inbound traffic to the Yahoo! network. In other words Yahoo! only makes 
reactive tests triggered on inbound traffic from that IP address, and 
pro-active tests are never performed by Yahoo!.

Minimal impact

Yahoo! strives to ensure that any testing performed as a consequence of 
the inbound traffic triggers have the least impact possible on the 
tested address.

Retest policy

Once an IP address has been tested, no further tests are performed for 
at least three days regardless of the outcome of the tests.

Actions based on test results

If an IP address is determined to be an open relay or open proxy, Yahoo! 
reserves the right to reject all SMTP traffic from that IP address for a 
minimum period of 60 days.

Source address of tests

All tests run by Yahoo! are run on readily identifiable servers that 
have forward and reverse DNS entries ending in yahoo.com. Any email 
addresses and servers used as part of the testing likewise are always 
identified with yahoo.com DNS entries or yahoo.com email addresses.

How to remove your server

You should check (and secure) your server for open relays (such as 
http://www.abuse.net/relay.html) and open proxies (such as 
http://www.unicom.com/sw/pxytest/ -- these may require installing 
software on servers outside your network for proper testing). After you 
are reasonably sure your network is secure, please submit your IP 
addresses to Yahoo! for retesting 
<http://help.yahoo.com/l/us/yahoo/mail/postmaster/defer.html>.


-Charles

Charles Jones wrote:
> Just thought I would mention that I know someone whose mail client was 
> malfunctioning (trying to login with the wrong password over and 
> over), and their IP was blocked with the same symptoms that you have. 
> Is there any chance that you did something to trigger their IPS? If so 
> then the solution is to just wait for the rule to expire :)
>
> -Charles
>
> Bryan O'Neal wrote:
>> Thank you, indeed I do get a hard reject saying that they are refusing
>> mail from my IP.  Only Yahoo is doing this and I am not on any of the
>> major spam lists but someone out their does not like me.  I would check
>> out DNSSTUFF, but I would rather not pay them their annual subscription
>> fee (With auto renew) for a one time search; are their any free black
>> list search service out their?  Or can some one who does have an account
>> please search DNSSTUFF for me on one of my IP's?  (66.193.205.166)
>>
>> 553 Mail from 66.193.205.166 not allowed - [10]
>>
>>
>> -----Original Message-----
>> From: plug-discuss-bounces at lists.plug.phoenix.az.us
>> [mailto:plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf Of
>> Richard Wilson
>> Sent: Wednesday, March 12, 2008 9:49 PM
>> To: Main PLUG discussion list
>> Cc: Arizona State University Linux Users Group
>> Subject: Re: Need some SMTP troubleshooting help - Please!.
>>
>> You can check your IP address on dnsstuff.com -- one of their services
>> checks to see if you're listed on any of 200+ Antispam services.
>>
>> You can also try a manual session, doing a telnet to a.mx.mail.yahoo.com
>> (or any of their other mail relays -- "dig yahoo.com mx" will give you
>> the list) and seeing what it is they don't like about you (I assume
>> conerstonehome.com in the example that follows):
>>
>> telnet a.mx.mail.yahoo.com 25
>> (wait for CONNECT msg)
>> HELO mailserver.cornerstonehom.com
>> (wait for 2XX response)
>> MAIL From: <id at cornerstonehome.com>
>> (wait for response)
>> RCPT To: <id at yahoo.com>
>> (wait for response)
>> DATA
>> send something here
>> .
>> QUIT
>>
>> You may get a 4XX ("soft"/temp) or 5xx (Hard) reject on one of the
>> responses that should indicate why they don't like you.
>>
>> HTH,
>>
>> Richard Wilson
>> (yes I have the "privilege" of getting mail addressed to postmaster at
>> too darn many domains...)
>> ------------------------------------------------------------------------
>> ---
>>
>> On Wed, 2008-03-12 at 19:23 -0700, Bryan O'Neal wrote:
>>   
>>> Ok I have a problem in that I am (still) unable to send anything to 
>>> Yahoo, or any domain who's email is hosted by Yahoo.  I don't get a 
>>> NDR, it is as if I simply can not connect and I get nothing in my 
>>> logs!  I believe it is connection oriented because three boxes (Two 
>>> exchange domains and one sendmail) with three external IP's have one 
>>> common point and that is one border router with one T1 connection.  
>>> But I can not get any response out of Yahoo and I can not give any 
>>> details because I have never had to trouble shoot down to this level
>>>     
>> before.
>>   
>>> Any suggestions on how to figure out what the *&!@$#! is going on with
>>>     
>>
>>   
>>> my SMTP connections to Yahoo?
>>>
>>> Bryan O'Neal
>>> Cornerstone Homes & Development, Inc.
>>> 4220 E. McDowell Rd Ste. #108
>>> Mesa, AZ 85215
>>> (480) 505-1900
>>> http://www.cornerstonehome.com

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