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Explanation spam statistics

Explanation spam statistics

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Since 2007, the IT Center has been using systems from the company IronPort (now a Cisco company) as spam filters, virus filters, and for spam detection for the entire university.

These systems already prevent more than 82 percent of spam emails from being accepted at all, or they are marked after acceptance, which significantly reduces the load on the university’s mail servers and users’ mailboxes.
The remaining emails that are accepted by the systems and forwarded to users may have virulent attachments removed and—if they are spam—are marked as such by adding *****SPAM***** / etc. to the subject line.

Currently, more than 77.5 percent of such delivery attempts can be rejected directly because the emails were sent from mail servers with a poor reputation.
Another 1.2 percent of emails are not accepted at all due to invalid sender and/or recipient addresses.

In the navigation bar on the left, you can view spam and virus filter statistics sorted by year and month.


 

Further information:

last changed on 05/19/2026

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