Spamassassin
SpamAssassin rocks! It just caught another spam for me. These are the results of why it tagged this email as a spam.
SPAM: -------------------- Start SpamAssassin results ----------------------
SPAM: This mail is probably spam. The original message has been altered
SPAM: so you can recognise or block similar unwanted mail in future.
SPAM: See http://spamassassin.org/tag/ for more details.
SPAM:
SPAM: Content analysis details: (31.6 hits, 5 required)
SPAM: Hit! (0.6 points) From: does not include a real name
SPAM: Hit! (2.0 points) Invalid Date: header (no timezone)
SPAM: Hit! (4.5 points) Character set doesn't exist
SPAM: Hit! (1.0 point) Subject has an exclamation mark
SPAM: Hit! (0.5 points) Received via SMTPD32 server (SMTPD32-n.n)
SPAM: Hit! (1.6 points) BODY: Claims you can be removed from the list
SPAM: Hit! (0.9 points) BODY: Asks you to click below
SPAM: Hit! (1.6 points) BODY: Claims compliance with SPAM regulations
SPAM: Hit! (2.0 points) BODY: Claims compliance with senate bill 1618
SPAM: Hit! (2.5 points) BODY: Uses a dotted-decimal IP address in URL
SPAM: Hit! (-0.1 points) BODY: Includes a 'remove' email address
SPAM: Hit! (-0.2 points) BODY: Includes a URL link to send an email
SPAM: Hit! (2.6 points) BODY: Link to a URL containing "opt-in" or "opt-out"
SPAM: Hit! (4.1 points) BODY: Link to a URL containing "unsubscribe"
SPAM: Hit! (3.5 points) BODY: Link to a URL containing "remove"
SPAM: Hit! (4.5 points) HTML-only mail, with no text version
SPAM:
SPAM: -------------------- End of SpamAssassin results ---------------------