To make sure you do not have mail worm called,
'Klez' please go to this link and download the
FREE program:
https://www.ku.edu/~acs/virus/viruses/klez.shtml
Scroll down to 'Klez Detector and Disinfector Tool'
Klez causes your email to send fake 118kb - 200kb
messages to people you normally write.
No problem but the tool will make sure that you do not have it on your system, it will not stop you from getting the emails unless you have special spam filters on your mail server.
If you do not understand how that works go to: https://www.google.com and do a search using keywords; spam filter, email filter.