In ALL Information Technology organizations there are many jobs to do and many hats to wear. There is absolutely, positively not one more important than S-E-C-U-R-I-T-Y. One of the most critical and key places to start is email security. Email, although a long time, standard-bearing tool of the Internet, to this day remains one of the first vulnerable points of attempted entry by nefarious sources.
Review the following Executive Guide on the RapidScale approach to security that begins at security and goes much, much further.