Work and communication today is hardly imaginable without e-mail.
Expectations of users regarding availability and reliability are
correspondingly high. Identifying and sorting out of unwanted
advertisement e-mails is annoying, costs »only« time and uses additional
resources of the IT
infrastructure. Grave consequences may ensue, however, if viruses,
worms, trojans or phishing e-mails enter and spread within the company
network. Lest this should ever happen, Knipp offers the installation and
configuration of various open source products and takes over their
periodic updating as well on request.
To protect against spam, Knipp uses the so-called greylisting and also
installs the open source software SpamAssassin on your mail server if
required. The principle of greylisting is comparatively simple. If a
sender that is not yet known sends an e-mail, this e-mail is at first
rejected by the mail server of the addressee. Only after a second try to
send it is the e-mail accepted and delivered to the recipient. Usually,
the senders of spam do not make any further tries to deliver an e-mail,
whereas mail servers of serious operators do.
SpamAssassin is a filter program, which automatically sorts out spam from
the incoming mail according to previously defined rules. To do so, the
program uses certain rules to assign so-called scores, which give the
estimated probability of the e-mail in question being spam. If a
pre-defined threshold is exceeded, the e-mail is marked as spam. An e-mail
thus identified can be deleted right away or moved to a spam folder, for
example.
With ClamAV, a virus scanner and
phishing filter is available. It is installed on mail servers and filters
out so-called e-mail worms and phishing e-mails.
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