Junk Folder
Spam or junk foldering — accepted mail the provider hides from the primary experience.
- Reading time:
- 5 min
- Difficulty:
- Intermediate
- Estimated duration:
- 5 min
- Prerequisites:
- None
- Last updated:
- 2026-07-15
- Author:
- empire
Definition
Junk (spam) foldering is when accepted mail is filed away from the inbox because filters judge it unwanted or risky.
Why it matters
Connect spam-folder outcomes to reputation, complaints, traps, and content — not only missing authentication.
How it works
High complaint rates, spamtrap hits, poor engagement, and weak identity signals increase junk probability. Users marking mail as spam reinforce the signal.
Limitations
- Some providers discard mail without a visible junk copy.
Common misconceptions
- Junk placement is always caused by a missing SPF record.
How to verify
- Inspect Authentication-Results and spam diagnostic headers on samples.
- Correlate junk spikes with list quality and complaint changes.