I think the title promises something that an otherwise well-written, enjoyable piece doesn't deliver. At no point does the author say or really allude to what her father's emails (specifically) taught her about the craft of writing.

A better title would communicate that the content is anecdotal, rather than instructive. Something like "How My Father's Emails Unknowingly Made Me A Writer".

Agreed. Skimming the article and it quickly became clear there wasn’t going to be anything specific about the emails. Was hoping for examples or insight into a specific writing style.

I wish he'd taught her about brevity.

After reading a few paragraphs, i started reading only the first line of each paragraph!