At IU, what is the spam quarantine service?

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Overview

UITS provides filtering services on all email accounts at Indiana University to reduce the amount of unsolicited commercial email (i.e., spam) stored on IU email servers. The services help you identify and eliminate unwanted email, and reduce the costly impact spam has on university resources.

The service analyzes all mail delivered to IU Cyrus/Webmail and Exchange accounts. Messages marked as spam are quarantined for five days in your Spam (Cyrus/Webmail) or Junk E-mail (Exchange) folder, and then are deleted automatically.

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Filters

The spam quarantine service uses separate filters on each mail system, as follows:

  • Cyrus/Webmail: The service employs Sophos PureMessage filtering, which analyzes incoming email for spam potential, and then assigns each message a score from 0 to 100%. Messages scoring 45% or higher are delivered to your Spam folder, where they're quarantined for five days and then automatically deleted.
  • Exchange: The service leverages the anti-spam capabilities built into Exchange and Outlook Web App (OWA). Exchange scans incoming messages and labels each one with a Spam Confidence Level (SCL) rating. Messages with an SCL of 6 or higher are delivered to your Junk E-mail folder, where they're quarantined for five days and then automatically deleted.

Email sent from within the IU community is not filtered.

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Spam deleted automatically

Monitor your Spam or Junk E-mail folder frequently, since messages more than five days old are deleted automatically.

You cannot retrieve email purged from the Spam folder in Cyrus/Webmail. However, email purged from the Junk E-mail folder on Exchange is available for recovery from the 180-day retention area.

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False positives

The spam quarantine service may deliver some false positives (i.e., messages that you want to keep) to your Spam or Junk E-mail folder. To keep such a message, move it to another folder. In Exchange, you can prevent future false positives by adding the sender to your Safe Senders list. In Cyrus/Webmail, you can add the sender to your Whitelist filter rule; see In IU Webmail, how do I use the Whitelist filter rule to avoid having legitimate mail quarantined as spam?

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Filtering during your vacation (or opting out)

If you're going away on vacation, or are otherwise unable to monitor your email account for five days, or if you'd rather not participate in the spam quarantine service at all, you can opt out of the service.

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Existing client-side filtering

You don't need to enable any client-side filtering to participate in the spam quarantine service, but you can choose to augment the service with client-side filters, rules, or junk mail features.

The spam quarantine service is compatible with the filtering rules in Cyrus/Webmail, which you can use to augment Sophos PureMessage filtering if needed.

If you use Outlook to read your Exchange account, you can have Cached Exchange Mode enabled to use Outlook's Junk E-mail filter to augment the anti-spam filter on the Exchange server.

Note:
If you're using Outlook 2011 or Entourage to read your Exchange account, beware of using client-side filtering, as it can generate false positives for messages from IU senders.

For help while using Office applications, press F1 or click the question mark on the upper right. For more, see How can I get help with Microsoft Office software?

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This is document spam in the Knowledge Base.
Last modified on 2015-07-17.

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