Reference: Email-SPAM

SPAM, Unsolicited Bulk Email, Unsolicited Commercial Email, etc. has increasingly become a barrier to effective use of Email on the Internet. It threatens the usefulness of basic Email services and we (RidgeStar) are a bit discouraged about the overall increase of SPAM and the results from it.

Our effort to intercept, reduce, and eliminate junk Email has motivated the adoption of 2 key mechanism in our Mail Servers.

DNSBL (Realtime Black Lists)

We utilize multiple DNS based Realtime Black Lists (a list of known or identified sources for SPAM) that will cause our Mail Server(s) to reject the Email message. This process occurs during an early portion of Message processing and the rejection of the Email is immediate.

Note that this mechanism is based upon "sender reputation" and is not based specifically on the content in any specific Message.

SpamAssassin

We also use an Open Source mechanism identified as SpamAssassin to analyze and screen individual message content.

Messages that SpamAssassin determines is likely spam will be redirected into an IMAP folder named "Spam". You can review any messages placed into the folder or marked with "[SPAM]" by looking in the Spam folder. As with any Email Folder, DO remember to delete these Messages when you no longer find them useful (they're SPAM and most folks don't have too much use for them).