Reminders

This will be an unhelpful post haha
As you may know, I've been trying to use my email more often.
Make Email Great Again, amiright?

I honestly do not want to use apps as that takes up space on my phone.
I check my email all the time and might as well use it for reminder.

Do you guys know a service/bot or even a program that I can install into my cPanel so I can start getting reminders on the date/time for reminders?

similar option is followupthen but I don't want to be paying. Looking for open-source.

Thanks in Advance,
HaxNet @ TekNiQ

update: I also just install remind (a CLI package) that I use for my Arch Linux.
It is quite simple to use and creating alias makes it even more easier to add reminders.