Insecure connection error received in Mac Mail / Gmail

Problem

• How do I resolve a connection error received when setting up Gmail in a third-party email application
• I received an error of Connection Insecure when adding my Gmail account to Mac Mail

Cause

• There may be a certificate error or your antivirus is activated

Resolution

• IT Services does not support the use of third-party email applications: For the best Miami email experience, we recommend the use of the Gmail web service

1. Delete any outdated certificates in your Key Chain
2. Temporarily disable your virus protection
3. Add your account using the Preferences window, specifically 

Notes

• Google provides up-to-date end-user instructions and support documentation for Google's Gmail web service
  • Browse the Google Gmail Help site for everything you want to know about using this popular web service
  • Check the Google Status Dashboard for the current performance status of this service 

System

• 10262: Google Mail (email e-mail) 
• macOS
• Mac Mail