This is a historical post, thus I am using a bit of historical liberty...
I attended a regional school for math and science while in high school, and we were issued a school e-mail address within the first week of my freshman year.
I'm embarrassed to admit that one of my first e-mails, if not my first e-mail, was to thank the principal of that school for the clean bathrooms.
I never received a response. I can only imagine that he laughed while shaking his head when he read my e-mail.
I also never figured out why an old PC on a cart was stored in the mens room... perhaps my first e-mail should have been to ask about that instead.
This was both the first and last time I made a compliment about clean bathrooms via e-mail... or email.