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Newsletter Email Messages Bounce

ok i have a user that sends out a news letter to a lot of people internally and externally.  i have recently heard that some of the emails go through and others bounce back saying that cannot send to this recipient.  what do i do????

thanks
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amoos

ASKER

the user has a group of people that she is sending to and about i would say 100 people and a majority of them go through and some do not bouncing back and saying user cannot send to this recipient.  she is sending the mass email out to multiple people on multiple external domains. i.e. comcast,juno,etc.

thanks
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ok i went to a tool on the internet to see if our server or our recipients were on any blacklist and they are not.  so i am going to try and check the ip's that the messages are being sent to to see if i can find anything else out.

any suggestions????
Without the exact text of the error messages the sender receives, diagnosis is quite difficult.

Simon.
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this is almost exactly what i get "You do not have permission to send to this recipient.  For assistance, contact your system administrator."

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the internal domain is .local and the external is .org.  dns is configured to use forwarders to our isp who hosts our dns
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this is what i get    

 See, Danielle on 11/15/2007 2:35 PM catholic.org
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <servername.mydomain.local #4.7.1 smtp;450 4.7.1 Client host rejected: cannot find your hostname, [12.xxx.xxx.xxx]>
The reason for your messages being bounced is quite clear - it is exactly what the error message says. Your server is telling the world its name is something.local, which is not valid on the internet. As a common antispam technique is to check if the sending server is valid, you fail on those tests.

You need to get your server setup correctly before you get blacklisted.
http://www.amset.info/exchange/dnsconfig.asp

Simon.
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ok.  this scares me.  on everyone else.  when they send out an email.  i do not or they do not get this error.  does this mean there is something wrong with the account??  what about changing the smtp banner to advertise the server??
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since my internal domain is .local and you saying i have to rebuild my server???  please say no.  i have been told by many including microsoft to separate my internal from my external
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oh thank god i do not have to rebuild.  ok so i have to change how the server is advertised.  so the way i know how to do it is to change the metabase.xml file, using the code 36907, save the file and restart smtp service.  do you know a easier way of doing this???
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the banner is what is validated right??  how to i modify the smtp banner in a gui so i do not get this bounce back message??  you are helping so much
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by changing the smtp banner or the way it is advertised to the outside will that effect anything on the internal domain side since our interanl domain is .local and external is .org??
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in the metabase.xml file that i can edit there are two entries, 1)36935 that has the .local address 2) i will add above that the 36907 entry for the servername.mydomain.org.  do i need to leave the .local in there or delete it??
Why are you looking at the metabase?
If you read the article I linked to above I have identified where you change the entry in ESM.

Simon.