At the time of writing this documentation yet another version of the Sober worm was circulating. This demonstartes clearly the importance of protection against virii, worms and other malicious software.
On our server we use special software to recognize virii, worms an malicious software. We try to keep this software as up to date as possible. If potentially harmful attachments are recognized a mail is not delivered to the reciever but instead is quarantined, and the actual reciever will be notified. Senders of such mails will not be notified, as this notification will probably not be delivered, since (almost) all worms fake the sender address.
IMPORTANT NOTE: Mails with attachments might still contain harmful software even though they have been checked by our mailserver. Whenever a new virus emerges the virus checker might not yet be able to recognize it as such. It is generally a good idea to have locally installed anti-virus software (kept up to date, of course) and to have it check the mails you recieve again. It is also a good idea to be generally suspicious of any attachment, even if the supposed sender is known to you.