Spam and virus filtering

To identify E-Mail as spam or virus-tainted and put into quarantine, at the TU Braunschweig the product of PureMessage that company SOPHOS used is that of a full E-Mail system, contains spam and virus filters and has web-based administration tools. Similarly, in a conventional manner such as virus scanners, make updates to their identifying features, this also happens to spam and virus filter of the PureMessage server.

All of outside addressed to the central e-mail system, e-mails, will be searched by the PureMessage servers for viruses and checked for spam probability and if necessary placed in quarantine. From a spam probability of currently 50% it is not delivered to the appropriate mailboxes. All transmitted emails get written a supplement in their heads, indicating the spam probability. If email placed in quarantine, the maximum mailbox once a day delivered an email with a summary, over the intended quarantine email. In order to extradite email from quarantine

following options exist:

  • To receive e-mails that are listed in a quarantined email, these must simply be returned only as a response email.
  • To get a single e-mail, must the quarantined e-mail be initially displayed in HTML, so that, for each e-mail identifier associated at the beginning of line is able to initiate response e-mail. However, this approach does not work at the webmail client alone. There must be installed another local e-mail client (like Thunderbird), which can take over the production and mailing of the response e-mail.
  • With the web-based access through https://spam.tu-braunschweig.de:28443, the quarantine can be managed and it can freely retrieved email from quarantine. The first time you open this page, you must first accept the certificate. Probably there is no password on the PureMessage servers of this e-mail address, so you must replace the page to https://spam.tu-braunschweig.de:28443/send_auth.cgi. Where after entering your e-mail address, a password and a HTML direct access is sent to your own  e-mail address. This can be repeated as desired and in each case leads to a new password.

Note: This password is only for the quarantine and does not change the password of the user ID.

Note: Within the web-based access, the delivery of the quarantined e-mail can be switched off.

Note: The Web-based access must be ensured, that in the quarantine of m.mustermann@tu-braunschweig.de, other emails will be found when in m.mustermann@tu-bs.de, although they are notified together in the quarantine email.

In all options, it should be noted that the service of the redeemed e-mails can be delayed by minutes, and that it can be done in several sending’s, if multiple emails are requested.

Note: In addition certain file formats in annexes to that email in quarantine assumes lead to spam and viruses. Annexes with the following file extensions are considered suspicious (suspect), so that the whole email will be quarantined:

*.ade, *.adp, *.bas, *.bat, *.chm, *.cla, *.class, *.cmd, *.com, *.cpl, *.crt, *.email, *.exe, *.hlp, *.hta, *.inf, *.ins, *.js, *.jse, *.lnk, *.msc, *.msi, *.mst, *.ocx, *.pcd, *.pif, *.reg, *.scr, *.sct, .*shb, *.shs, *.url, *.vb, *.vbs, *.vbe, *.wsf, *.wsh, *.wsc

 *.???.exe, *.???.lnk, *.???.pif

E-mails containing viruses on the Web-based access to the quarantine cannot be unlocked. Viruses pose a great danger, not only for the respective computer, but also to all other computers in the network.

  last changed 11.11.2013
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