A problem occurred while sending the email. - Name or service not known

I am getting an error when trying to setup the smtp email server. See below.

Steps to reproduce

  1. Enter SMTP email server account settings and try to send a test email.

Expected behaviour

Should send test email

Actual behaviour

I get this error: "A problem occurred while sending the email. Please revise your settings. (Error: Connection could not be established with host snowman.nocdirect.com :stream_socket_client(): php_network_getaddresses: getaddrinfo failed: Name or service not known)

Server configuration

Operating system: Ubuntu 20.04.4. LTS

Web server: Apache

Database: Mysql

PHP version: PHP 7.4php

ownCloud version:

**Updated from an older ownCloud or fresh install: Updated from previous versions.

**Where did you install ownCloud from: Linux distribution packages

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