Unable to receive external email

[daryllim]

Hi,

I am testing exchange server 2003 standard.

Internal send/ receive all work fine, send to outside domain ok but not send from outside (simply by replying to that sent email from Exchange user), the emails did not come in.

I am using IP addresses as email domain, e.g. abc@123.456.1.1 , and the external recipients able to receive and see the email address as this.

123.456.1.1 is the ADSL router address,
also have enabled the port forwarding in the router:

port 25 to 123.456.1.2 (exchange server address)
port 110 to 123.456.1.2

I read thru' posts and also tested to

"telnet exchgeserver-internalIP 25" - ok
"telnet exchgeserver-externalIP 25" - not ok "Connection to host lost"

What could be the problem? Many thanks.

Regards,
Daryl

 

[markdmac]

You either have a firewall issue that is blocking port 25 incoming or your ISP is blocking it since you can't telnet in.

I hope you find this post helpful.

Regards,

Mark

 

[daryllim]

Hi Mark,

Tks again.
There is any firewall except the router which I enable telnet access also under WAN settings.

As for ISP, it has also come with a email account for the Internet plan, if port 25 is blocked, but we still can receive emails for this ISP email account.

Tks.

Regards,
Daryl

 

[daryllim]

sorry,

corrections in my 1st post

for 123.456.1.1 is the Public WAN IP.

so port forwarding is:

port 25 to 192.168.1.2 (exchange server internal address)
port 110 to 192.168.1.2

daryl

 

[paulpr90]

Hi,

I have had the same problem recently and I discovered that the ISP setup was wrong. DNS settings for mail were not set correctly.

Check your mail settings for correct ip address.

Paul.........

 

[markdmac]

Verify with your ISP that they are not blocking port 25. When an ISP blocks the port it usually will allow port 25 traffic inbound only from their own servers.

I hope you find this post helpful.

Regards,

Mark

 

[daryllim]

Hi,

I ve checked with the ISP, and they are not blocking the port 25, as they told that the email account will not be able to work if they block the port.

Regards,
Daryl

 

[daryllim]

Hi,

I am able to receive emails now after i changed the gateway address.
I did use another internet gateway address rather than the one I set in Exchange and mail forwarding.
Quite a stupid mistake made.

Thank you.

Daryl