Request for input on error "Failed to connect to SMTP host XYZ.COM"

HCL Domino Domino Forum
1

Hello folks,

I am writing SA exam soon and would like to have myself covered for potential questions on this particular Domino configuration error:

{

Router: Failed to connect to SMTP host XYZ.COM because : The server is not responding. The server may be down or you may be experiencing network problems. Contact your system administrator if this problem persists.

}

I am a “seasoned” Domino Developer but a very green Admin, so please bear with me, folks! Ok, after various research in the forum and IBM Lotus technote, I have managed to gather the following potential “causes” and their respective “resolutions”:-

Cause 1:

The port 25 for SMTP traffic has not been opened for the Domino Server.

Resolution:

Open up the port 25 for SMTP traffic on the corporate firewall.

Cause 2:

There is domain name resolution issue for the Domino Server.

Resolution:

Specify the hostname of the DNS server in the notes.ini file by adding the line “DNSServer=xx.xx.xx.xx”.

Cause 3:

You are using a gateway for SMTP outbound traffic (e.g. a firewall server or an ISP server) but this has not configured in the configuration document of the Domino mail server.

Resolution:

Put the resolvable hostname of the SMTP gateway into the configuration document of the Domino mail server.

  1. Edit the configuration document,

  2. Go to the Router/SMTP tab and click on the Basics tab,

  3. Update the hostname of the DNS server under the field “Relay host for messages leaving the local internet domain:”,

  4. Save and close the configuration document,

  5. Restart the Domino Router.

Did I missed anything else besides the above? Please advise me, and thanks in advance!!! =)

Cheers!

Teck Lung