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Understanding Junk scoring
Internet Services marks messages with a High spam score (51-100) or above as Junk. Internet Services also follows the Precedence header of a message to determine if it must mark a message as Junk. If the sender sets the precedence of the message as Junk, he receives Junk priority on inbound mail.
Certain mailing list programs include a Precedence, which is a header in the messages they send. This is how Internet Services maps the different header values into FirstClass priority values:
  Note The FirstClass priority value 'Junk' is not available on the FirstClass client menu.
The following are the conditions that would immediately cue Internet Services to increase a message's spam score enough to mark it as Junk:
• the subject or body contains a word in the rules.Subjectblock list, and such messages have not been set to be blocked with an NDN
• the subject contains any variation of the word "Viagra", "Xanax" or "drugs"
• the subject or body contains more than one word in the lists.Rude list in the Filters folder
• any X-Mailer text in the lists.x-mailer-1 list in the Filters folder is found
• specific X-headers used by spammers are found
• the body contains false disclaimers saying the message isn't spam because it conforms to the American CAN-SPAM Act of 2003
• the body contains any variation of the word "Viagra" or "free"
• an attachment name is detected and both it and the subject are in the lists.VirusNetskyAttachment list in the Filters folder
• the body contains URLs to images used by spammers to track who has read the message
• the body contains URLs to domain names ending in .biz
• the body contains URLs to images that look to users like they are at one server when they are actually at another
• the body contains URLs that lead users to a different site than they think they are heading to.
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