<div>
have you checked if your IP is blacklisted, contact your ISP and let them know the issue. it should be resolved from their side.
</div>


<div>
this is typically because the IP you are sending from doesn't have a PTR record <br />
<br />
go to <a href="http://mxtoolbox.com" rel="ugc">http://mxtoolbox.com</a>&nbsp;and run a diagnostic 
</div>


<div>
But we have been sending mail for years to those addresses. <br />
<br />
How do create a PTR record? <br />
<br />
Jeff
</div>


<div>
a PTR record should be created by your ISP, run the diagnostic first
</div>


<div>
I ran it and it listed the ISP name server. Pretty sure we have a ptr record. &nbsp;went through something similar a year ago. 
</div>


<div>
Thanks <br />
<br />
Akhater. <br />
<br />
I tried that a this is the error i get <br />
421 4.7.1 All messages from 208.66.3.227 will be permanently deffered; re trying will not succeed. <br />
<br />
see <a href="http://postmaster.yahoo.com/421-ts03.html" rel="ugc">http://postmaster.yahoo.com/421-ts03.html</a>.<br />
<br />
checking link now. <br />
<br />
Any suggestions. 
</div>


<div>
you are blacklisted<br />
<br />
This error message indicates we are seeing a high volume of messages from your IP address that is a characteristic of unsolicited, bulk emails. While this is a temporary SMTP error code, we do not recommend attempting to resend your messages until you examine your subscription practices and lists, and implement changes to ensure that your messages are sent only to users who have requested it<br />
<br />
<br />
<a href="http://help.yahoo.com/l/us/yahoo/mail/postmaster/errors/421-ts03.html" rel="ugc">http://help.yahoo.com/l/us/yahoo/mail/postmaster/errors/421-ts03.html</a>
</div>


<div>
okay getting some where. <br />
<br />
i need to send Yahoo some info and I am not sure how to get this<br />
<br />
<br />
* Log messages from your mail server showing which IP you connected to<br />
and what responses you got from the remote server at the time you<br />
received the failures.<br />
<br />
how do i pull that log?<br />
<br />
Jeff
</div>


<div>
Wow I am still blocked. <br />
<br />
Driving me crazy. &nbsp;<br />
<br />
I confirmed we are not compromised, PTR records in place. <br />
<br />
but still Yahoo clocks us any suggestion guys. <br />
<br />
i am desperate.<br />
<br />
Jeff
</div>


<div>
<div class="content wysiwyg-content">
Hey Guys.<br />
<br />
Not sure whats up here My exchange server can deliver mail to the about mentioned domains. <br />
<br />
It sits in the queue for a few days then I get a 4.4.7 error saying <br />
<br />
This is an automatically generated Delivery Status Notification.<br />
<br />
&quot;Unable to deliver message to the following recipients, due to being unable to connect successfully to the destination mail server.&quot;<br />
<br />
<br />
Where should i Start o troubleshoot this issue?<br />
<br />
Jeff
</div>
</div>


Hey Guys.

Not sure whats up here My exchange server can deliver mail to the about mentioned domains. 

It sits in the queue for a few days then I get a 4.4.7 error saying 

This is an automatically generated Delivery Status Notification.

"Unable to deliver message to the following recipients, due to being unable to connect successfully to the destination mail server."


Where should i Start o troubleshoot this issue?

Jeff

Exchange Yahoo.com, Rogers.com, Yahoo.ca  cant send mail to them

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.