No you should be alright, but perhaps never say never
If you wish to scan your computer the
use sophos free for home use or Clam xav also free from the app store
Many on here will say that malaware does not exist and that placing antivius on a mac is not needed
but coming from using a pc I have had no problems with sophos.
from usa today
If you clicked a link in the email and it opened in your web browser with Java enabled, that's different. You should not leave Java enabled all the time, for all sites. If you must use a Java applet for a task on a specific site, enable Java only for that site in Safari.