Detection is automatic. STAMP reads List-Unsubscribe headers and standard bulk-mail signals. Anything matching is tagged Newsletter and routed out of the headline. The detection is conservative — if STAMP is unsure, it leaves the email in the main queue and you can tag it manually.
The newsletter view is a one-keystroke jump from anywhere. ⌘+K, type 'news', hit return. You're in the newsletter view. The unread count there is informational, not anxiety-inducing.
Reading is your choice. Skim weekly on a Sunday morning. Read every issue of the three you love. Ignore the rest for two months. STAMP doesn't pressure either direction.
Unsubscribe is one keystroke. Press U on any newsletter. STAMP fires the List-Unsubscribe header through the protocol, which is the clean way to leave a list — no log-in pages, no 'we'll miss you' surveys. Done in milliseconds.