Hacker News new | ask | show | jobs
by orliesaurus 898 days ago
Ahhh I see what you mean now, but it wasn't clear in your initial question.

Gmail's algorithms analyzes, and has been doing over the last ~20 years, a combination of factors to classify emails as promotional or transactional!

Nothing in the code itself of your email will indicate that, other than the presence of an unsub link + the rest of the footer (which is the obvious sign that's a marketing email)