Automatic Gmail sending Background

My physical condition has been lost, and I have to face my face once a weekend.
There are situations where you can't even send e-mail, so you don't have to worry about it, so I want to send a notification automatically.

I want a mechanism for automatically sending fixed phrases at a fixed time on a fixed day of the week

What i am currently working on
  • Examine the mechanism to realize the requirements
  • Put a mailer in Docker/CentOS7 and run it regularly from Jenkins

I don't know how to do external design because I don't have experience with mailers.

  • Gmail automatically sent at 22:00 on Friday
  • You can use fixed phrases (but I want to keep the contents in an external file so that you can edit them easily)