… received an email from my local library.

It was letting me know that the Kindle book I had reserved was ready.

The “From” line was: C/W MARS

The “Subject” line was: C/W MARS digital hold automatically borrowed

I nearly deleted it, thinking it was spam.

If you work in the library, of course, words like “C/W MARS” and “digital hold” make perfect sense. You use them every day.

If you don’t, however, and you’re just a book-borrowing private citizen quickly scanning emails to see what can be ignored, they don’t.

Are you clear who your audience is before you begin writing?