Structural / Gmail metadata

21 signals in this category. Every entry links to a full explanation, severity tier, and false-positive notes.

What most signals in this category mean

Warning signal — bulk / marketing / mild spam. Contributes to the trash score but is not by itself sufficient.

Declared text/plain but contains HTML (filter evasion)warning
content-type-mismatch
Date header set far in the past (bottom-of-inbox hide)warning
date-in-distant-past
Date header set far in the future (top-of-inbox manipulation)warning
date-in-future
In Gmail Forums tabwarning
gmail-forums-tab
Marked important by Gmailwarning
gmail-important
In Gmail Promotions tabwarning
gmail-promotions-tab
In Gmail Social tabwarning
gmail-social-tab
In Gmail Updates tabwarning
gmail-updates-tab
Subscribed but never read (graymail)warning
graymail
HTML-only email, no plain-text alternative (cheap spam tooling)warning
html-only-no-text-alt
Image-heavy email with little textwarning
image-heavy-email
Missing Date header — RFC 5322 §3.6 violation; direct-to-MTA injection or bulk mailer stripping headerswarning
missing-date-header
Missing MIME-Version header (malformed bulk mailer)warning
missing-mime-version
Read and kept by userwarning
read-and-kept
Sent at 2–5 AM UTC botnet windowwarning
send-time-anomaly
Sent to your own address (spoofed From — sextortion/account scam)threat
sent-to-self
Cyrillic/legacy charset (spam infrastructure indicator)warning
suspicious-encoding
Unread for 180+ dayswarning
unread-old-180d
Unread for 30+ dayswarning
unread-old-30d
Unread for 90+ dayswarning
unread-old-90d
User-applied label (organized)warning
user-labeled

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