Re: Exchange 2003 smtp relay
From: Lanwench [MVP - Exchange] (lanwench_at_heybuddy.donotsendme.unsolicitedmail.atyahoo.com)
Date: 02/15/05
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Date: Tue, 15 Feb 2005 10:15:37 -0500
CoolD wrote:
> My Exchange 2003 Server cant send email to some email servers. Here
> is a sample NDR error message.
>
> There was a SMTP communication problem with the recipient's email
> server. Please contact your system administrator.
> <execunets.com #5.5.0 smtp;550 You are not allowed to send mail.
> Please refer to www.spamhaus.org, dsbl.org and njabl.org for more
> information.>
>
> I can tell from this message that my server is DNS blacklisted. I can
> not get my server off of the blacklists because my ISP who has issued
> the static IPs for our mail server are not skilled enough to keep
> their subnets off of blacklists. My ISP will also not allow me to
> relay through their SMTP server.
Get a new ISP?
Or try something like www.dyndns.org - they have a relay service you can
use.
I personally like the "get a new ISP" answer, because either these people
need to let you relay, or they need to fix their stuff. And perhaps even if
you could relay through their server, you wouldn't be able to send - as
their own servers are likely to be blacklisted as well. What are the reasons
for the blacklist when you look them up according to the NDRs you receive?
>
> I also try to send email to some mail servers that are not using spam
> protection and the email never arrives either, but they only return
> delay messages.
Could be unrelated - can you resolve the domain on the server? query
successfully for the MX records? telnet to their server on port 25
successfully?
>
> I have another client with an Exchange 2003 server that I would like
> to use as a outgoing mail relay so that it will mask my servers
> blacklisted IP address and I will be able to send mail to the
> internet succesfully. I have total control over both servers.
I wouldn't do that - I'd go with a third party if you can't get a new ISP. I
doubt your client will appreciate what can happen if they have a lot of
unrelated traffic going through their server & using their bandwidth - or
perhaps getting blacklisted themselves due to something coming from your
server. I always disable all relay on Internet facing servers, including
authenticated relay & even for the local subnet.
>
> The problem is that I cant get it to relay properly. On my clients
> relay server, I configured the SMTP virtual server to allow my severs
> Public IP to relay. On My own server, I configured the SMTP connector
> to forward all email through my clients server
>
> The email seems to get stuck in the SMTP connectors queue on my
> server.
>
> Please point me in the correct direction.
Don't use the virtual SMTP server - create an SMTP connector, using * in the
address space, and set up the smarthost in there. Undo what you did in the
virtual SMTP server.
If you must do this,
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