Setup mail server on ODK Central (on-prem server)

1. What is the problem? Be very detailed.
I have an ODK Central already running on-perm Linux. Now I want to configure ODK Central to use a new mail server so that ODK Central (on-prem host) could work with the new mail server. How to configure and then restart ?

2. What app or server are you using and on what device and operating system? Include version numbers.
ODK Central v1.1.2, on-prem CentOS7.
3. What you have you tried to fix the problem?
Configure ODK Central to use a new mail server.

4. What steps can we take to reproduce the problem?
Review the documents.
5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.

What step at https://docs.getodk.org/central-install-digital-ocean/#using-a-custom-mail-server are you stuck on?

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