Here [1] is a list (extracted from volume 50 apparently) of suggested excerpts. Supposedly, if you spend just 15 minutes a day reading these, you will become well educated in just a year. Note: I have not tried this.

[1] https://www.myharvardclassics.com/categories/20120612_1

Note, some of them require signing in.

I wonder how well this list would work as a mailing list.