Pieter wrote:

And what about malicious emails that enter?

You still run an on-access scanner, and, even better than that, you have a
brain. In 99% of all malware cases a five second examination of the message
will tell you to simply delete it without opening any attachments. Malware
depends on user stupidity. - clicking to open an unrecognized and
unrequested attachment without first saving it to disk or verifying the
sender.

No other solution that keeps my network administrator in peace? :-)

Then your network administrator doesn't understand the nature of the
majority of malware threats.
--
Brian Tillman