A simple VBA script to help send email using Excel, using CDO object or Outlook.
While using Gmail SMTP server with CDO object, you will have to "Allow less secure apps"
https://support.google.com/accounts/answer/6010255?hl=en
https://www.makeuseof.com/tag/send-emails-excel-vba/
https://stackoverflow.com/questions/46155/how-to-validate-an-email-address-in-javascript
https://officeguide.cc/excel-vba-regular-expressions-regex-tutorial/