Missing PHPMailer is Required for SMTP to function

Problem/Motivation

Missing PHPMailer is Required for SMTP to function. Is there clear instructions on how to get Drupal to find this library or how to installed it correctly so it works with Drupal, installed it several times but still getting this missing PHPMailer error.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet