That was discontinued for most users during the pandemic. If you are using a "free" gmail account, forget it. If you are using a corporate, paid for, Google Workspace, account there are a couple of ways. Each has restrictions.
This article is for Google Workspace administrators who want to send email from devices or apps in their organization or domain. If you're a Gmail user who wants to send email from a device or app, contact your organization's administrator.
Send email from a printer, scanner, or app - Google Workspace Admin Help
The first option is using a relay server. It can be either Google's relay service, which your organizational administer has to add to the corporate account and configure. Or you can use a third party relay which Stunnel is an example.
Also check with your internet service provider. Some also provide email relay service. Like Google, they provide it but you have to configure and manage it.
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