Tools

Configure SMTP Server with a Hostname or IP Address in Kiwi Syslog Server NG

The SMTP server field in Kiwi Syslog Server NG (KSS NG) accepts either an IP address or a hostname/FQDN, as long as it resolves correctly from the KSS NG server.

First published date

3/16/2026 3:47 PM

Last published date

3/16/2026 3:47 PM

Overview

You may be uncertain whether the Hostname or IP address of SMTP mail server field in KSS NG accepts a fully qualified domain name (FQDN), a short hostname, or only an IP address. This article clarifies what formats are supported.

Product section

Kiwi Syslog Server

Cause

The Hostname or IP address of SMTP mail server field is a flexible text field that supports multiple input formats. There is no restriction limiting it to IP addresses only.

Resolution

The Hostname or IP address of SMTP mail server field accepts any of the following:

  • An IP address (e.g., 192.168.1.50)

  • A short hostname (e.g., mailserver)

  • A fully qualified domain name (FQDN) (e.g., smtp.company.com or mail.company.com)

Note: Enter only the hostname or IP address — do not include a protocol prefix such as https://. The field does not accept URLs; only plain hostnames or IP addresses are valid.

Using an FQDN is fully supported, provided that the FQDN resolves correctly via DNS from the KSS NG server. If DNS resolution fails, the SMTP connection will also fail.

Steps to Configure the SMTP Server

  1. Log in to the KSS NG web console.

  2. Navigate to Setup > Settings.

  3. Click Mail.

  4. In the Hostname or IP address of SMTP mail server field, enter your SMTP server's IP address or hostname (e.g., smtp.company.com).

  5. Specify the Port number (default: 25; SSL: 465; TLS: 587).

  6. Select the appropriate Security type: None, SSL, or TLS.

  7. Click Test to verify connectivity to the SMTP server.

  8. Click Apply to save your changes.

Verify DNS Resolution (if using a hostname or FQDN)

If the SMTP connection fails when using a hostname, verify that DNS resolution is working correctly from the KSS NG server:

  1. Open Command Prompt on the KSS NG host.

  2. Run: nslookup smtp.company.com

  3. Confirm the hostname resolves to the expected IP address.

  4. If DNS resolution fails, work with your network administrator to correct the DNS configuration or use the IP address directly in the SMTP field.