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problem sending emails to a specific address

hello expert
i`m running exchange 2003 on windows 2003 wich is a DC on the same machine,
recently im having problem to send emails to any of craigslist addresses, the error msg is
Your message did not reach some or all of the intended recipients.

      Subject:      test
      Sent:      10/2/2007 8:38 AM

The following recipient(s) could not be reached:

      job-437765347@craigslist.org on 10/2/2007 8:36 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <server.activenet.local #5.5.0 smtp;554 <ool-18bc8e8b.dyn.optonline.net[24.188.142.139]>: Client host rejected: Please use SMTP relay of your ISP or setup non-generic DNS>
i have tried to setup an smtp connector to forward all emails through my ISP but it doesn`t work
all emails stll stuck on the que.
please advice...
thanks
 
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activenet1
Asked:
activenet1
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2 Solutions
 
SembeeCommented:
You need to continue to pursue using the SMTP connector to route email through their server, as you are being rejected because your IP address is on what looks like a dynamic address list.
Ask your ISP if you need to authenticate when sending email through their smtp server, you should also ask if they need to know your domain to allow emails through the server.

Simon.
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activenet1Author Commented:
thanks guys, i just talked to my ISP support, the problem is because im using dyn ip and follow my isp my options are to have an static ip with additional fee, is there any other way to convert dyn to static without having a real static?
thanks
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SembeeCommented:
Your ISP controls your IP address. Therefore you cannot make the address static yourself. The ISP has obviously decided they can charge more for a static address and will have measures in place to ensure that your address remains dynamic.

If you want to send email directly you will need to have a static IP address.

If you do not want to spend on a static IP address then you should be allowed to use your ISPs SMTP server to send email through. That is what home users with Outlook Express will use.

Simon.
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activenet1Author Commented:
i have tried to use my isp smtp but still i couldn`t send emails
i guess i will swich to static
thanks i will split points
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activenet1Author Commented:
Simon
i dont know why but i think my ISP(cablevision-optimumonline)is blocking me from sending
emails through  the`re smtp server.
i tried to setup a connector but all the emails still stays on the server que
is it possible my isp doesn`t allow me to route emails ?
thanks
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SembeeCommented:
You would have to ask the ISP that question.
There is every chance that the ISP will block relaying of emails through their server unless the email is from an address on their own domain. They may also require authentication when sending email through their server.
It is impossible for me to know for sure as every ISP is different.

Simon.
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