exchange routing outgoing mail through my isps mail server

One of our clients is running exchange 2003. We have been having some problems where every now and then we get listed on spam blacklists. This is causing problems with sending email.

In short, I would like to setup a connector so that mail is sent via my isps mail server, can someone help?

I tried to set it up once, following the instructions here:
http://www.amset.info/exchange/smtp-connector.asp

But then, every message I tried to send I would get an ndr with this error:

"A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients."

Any ideas?
davids355Asked:
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BBRazzCommented:
THe Amset article is correct. In the address space, just use * rather than any domains.

Make sure it is also the only SMTP connector, and that in your Virtual SMTP Server you have no Smart Host configured there either.

-BBRazz
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jesusrulesmeCommented:
I've set up many smtp connectors to go through an ISPs smtp servers and those instructions are correct.  I would recommend testing to make sure your ISP is allowing this by setting up a dummy Outlook Express account.  Make up an email address and pop3 server, but put in the ISPs smtp server.  Send a test message to a webmail account that you have and see if you receive it.  Make sure to enable the workstation to be able to send port 25 outbound through the firewall, or do it on the Exchange Server.  If you are able to send it through your ISP, then those instructions should enable you to setup the connector.  Set it up again and if it fails, post the NDRs you are getting.
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davids355Author Commented:
hmm, tried to telnet into my isps email server (from within my exchange server).

It is asking for authentication, so I guess that is the problem.

How would I get round that?
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BBRazzCommented:
Speak to your ISP.

They may be able to offer a mail server that is restricted by IP rather than Authentication.

-BBRazz
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lance_corporal_jonesCommented:
If the above fails it may be better to try and solve the actual issue which is why are you getting on spam lists.

The spam companies usually mark mail coming in from a dynamic IP range as spam, so buy a static IP if you havent already.

Also make sure your PTR record for your DNS is setup correctly and also the SMTP banner, this link gives a good explanation of all of these:

http://www.amset.info/exchange/dnsconfig.asp

Once you have done that the spam problem should improve.
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MesthaCommented:
If you were getting an authentication prompt, it shouldn't cause the messages to bounce between the servers. If the email was failing on authentication then the messages should sit in the queue with that as the error.

As the ISP if you do need to authenticate when sending only through their servers. Many ISPs will have their systems setup so that if you collect email from them using POP3 first, you don't have to authenticate for sending, but as you are not doing that, specific authentication may be required.

Simon.
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davids355Author Commented:
lance_corporal_jones:
I have already checked most of these things: we have a fixed ip, we have a ptr record setup and we have the correct smtp banner (we can use nslookup and we get an FQDN for our servers ip that matches our smtp banner so that should be ok).

As for the spam problems, recently one machine had a virus on it which caused our ip to be listed. I have removed virus and removed all listings except for 1 that takes 7 days for auto removal, just dont really want to wait the seven days.

Aside from that, we also have had problems sending to a few domains anyway (before our ip was listed), when telnetting to those domains, i would just get a blank screen but telneting from outside the domain worked fine).

So I figured setting up a connector would nto only get us out of trouble initially, but would also make it less likely that we would get problems in the future??....
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davids355Author Commented:
tried phoning BT (our isp) but they didnt seem to know what I was talking about when I asked if they could allow our ip to relay through their mail server. What should I be asking/who should I ask to speak to?
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lance_corporal_jonesCommented:
You need to speak to the most senior IT people, if that fails escalate to the highest tier of tech support as they normally know there stuff.

Trouble is someone big like BT will probably not be flexible enough to support bespoke requests like yours, they probably have a rigid system and will stick with it, they may not have enough to change authentication on a per customer basis.

If you dont have any luck with BT you can try Google for SMTP relay servers which you can subscribe to, otherwise only other option may be to change ISP, e.g Zen.
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MesthaCommented:
Last time I had anything to do with BT you had to ask them to put your domain on to their relay list. They had a procedure to do that.

Simon.
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