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O365 SPAM and Antivirus

How does spam filtering work?

Every message, inbound and outbound, is assigned a spam confidence level (SCL) based on the likelihood that the message is spam. Depending on the SCL, an inbound message may be relayed directly to the user’s Junk Email folder. All content-filtered messages are relayed to the user’s Junk Email folder by default. On outbound messages, if the SCL indicates that a message is spam, it is either routed through the high risk delivery pool, or it is bounced and not delivered. If the message isn’t delivered, the sender should receive a message, called a delivery status notification (DSN), or bounceback. telling them that the message couldn’t be delivered.

How can individual users manage spam?

Users can manage some spam settings for their own mailbox, using Outlook or Outlook Web App.

By default, the Junk E-mail Filter protection level is set to No Automatic Filtering. You can make the filter more aggressive so it catches more junk messages. The higher you set the protection level, the greater the risk of some legitimate messages being identified as junk and moved to the Junk E-mail folder.

  1. Click Home > Junk > Junk E-mail Options.
  2. Choose the level of protection you want.
    • No Automatic Filtering     Although this turns off the automatic Junk E-mail Filter, messages are still evaluated by using the domain names and email addresses in your Blocked Senders List.
    1. NOTE:  If you want to turn off the Junk E-mail Filter, you must also remove names form the Junk E-mail Filter lists.
    • Low     If you don't receive many junk messages, or want to filter only the messages that are the most obvious junk, select this option.
    • High     If you receive lots of junk messages, but don’t want to restrict messages from senders on your safe lists, select this option. We recommend you occasionally check the Junk E-mail folder to make sure that a message you wanted isn’t moved in error.
    • Safe Lists Only     This is the most restrictive option. Any message that is sent neither from someone on your Safe Senders List or to a mailing list on your Safe Recipients List, is classified as junk.

You can tell Outlook to delete all suspected junk messages instead of moving them to the Junk E-mail folder. This takes away your ability to review messages for possible false positives, so consider the risks of using this option.

  1. In Mail, click the Home > Junk > Junk E-mail Options.
  2. On the Options tab, check the Permanently delete suspected junk email instead of moving it to the Junk E-mail folder box.

How does virus protection work?

Exchange Online Protection combats malware, including viruses and spyware. Viruses infect other programs and data, and they spread throughout your computer looking for programs to infect. Spyware refers to malware that gathers your personal information, such as sign-in information and personal data, and sends it back to its author.

The EOP service offers multi-layered malware protection that’s designed to catch all known malware traveling in to and out from your organization.

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