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Some email relies Smart Host to deliver

Kane
4/6/2006 9:15:52 AM

iis smtp nntp:

Hi;

My internal SMTP server is configured on one of three W2K Active Directory
domain controllers server, I found that if I do not use Smart Host; some
email cannot be delivered. For example; if my user want to send an email to
a recipient at "hotmail.com" and "sympatico.ca", etc. The email always sits
on the queue until I instruct it to send via my Smart Host in DMZ network.
Here is the ip configuration of all my server.

DC1
IP: 192.168.0.1
Primary DNS : 192.168.0.2
Secondary DNS : 192.168.0.3

DC2
IP: 192.168.0.2
Primary DNS : 192.168.0.1
Secondary DNS : 192.168.0.3

DC3
IP: 192.168.0.3
Primary DNS : 192.168.0.1
Secondary DNS : 192.168.0.2

Where DC3 is my internal SMTP server.

Smart Host in DMZ

IP : 64.x.x.1
Primary DNS : 127.0.0.1

* My Smart Host is also a DNS server itself.

I think, I can email to 80% of other domain.

When I reviewed the EventViewer, I also found these warning..

"Message delivery to the remote domain 'sympatico.ca' failed for the
following reason: The connection was dropped by the remote host"

"Message delivery to the remote domain 'hotmail.com' failed for the
following reason: The connection was dropped by the remote host"

I also tried to use the DNS servers ip address as the Primary DNS and the
Secondary DNS on DC3 but still no help, because I thought, would it be the
DNS problem.

Any idea?

Thanks!

Re: Some email relies Smart Host to deliver

Christopher Reed
4/8/2006 7:48:36 AM

Try using 127.0.0.1 as the smart host. If you do not have any ports block
going outside, it should work.
--
Christopher A. Reed
"The oxen are slow, but the earth is patient."

[quoted text, click to view]

Re: Some email relies Smart Host to deliver

Kane
4/10/2006 3:11:00 PM

Hi Chris;

thanks for your suggestion but it is still not working after applied your
recommendation, even though, I open a NAT to this internal server from
firewall.

[quoted text, click to view]

Re: Some email relies Smart Host to deliver

Christopher Reed
4/12/2006 7:05:49 AM

Some of these mail recipients will either reject your message or have to go
through a drawn out process to "okay" your message. It is probably the
later that you are seeing. We had a problem with this. To resolve, make
sure that the From address is either your main domain name or your mail
domain name, even though it's not coming from either.
--
Christopher A. Reed
"The oxen are slow, but the earth is patient."

[quoted text, click to view]

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