How does your hosted spam filtering service work?

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Our spam filtering service works by directing all of your incoming mail through our hardware spam filters. Once mail for your domain is received the filtering begins. The messages go through:
  • IP Reputation Filters
  • Sender Domain Filters
  • Attachment Filters (Including Anti-Virus)
  • Subject Filters
  • Body Filters
  • Header Filters
  • Reverse DNS Lookup Filters
  • Sender Authentication Filters
  • Bayesian Analysis Filters
The majority of spam messages are immediately Blocked based upon the sending server's address and are not processed by any subsequent filters. Other messages that go through each filter are assigned a spam score and are either AllowedBlocked or Tagged with [BULK] in the subject depending on the score. 

What happens to your messages:
  • Allowed: Allowed messages are forwarded to your mail server for delivery to your mail client.
  • Blocked: Blocked messages are discarded by the mail filter. These messages will not be forwarded to your mail server.
  • Tagged: Tagged messages will be updated with the phrase [BULK] in subject line and will be fowarded to your mail server. They will also show up in your mail client.

Messages with [BULK] in the subject have a very high probability of being spam and should be directed into your Junk E-mail folder by setting up a mail rule in your mail client.

If you would like to see all messages, including blocked ones, then view the article: How does your Quarantine service work?

Note: When using Outlook 2003 or 2007 which have built in spam filters, you may see messages end up in your Junk E-mail folder that are not spam. These messages were moved there by your local Outlook client and were not classified as spam by the spam filtering service. To move these messages to your inbox: right click on the message in the message list, click Junk E-mail, click Mark As Not Junk.

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