Do you receive something like this? Check your spam folder, you might missed it, thanks to effective spam filter by your provider.

For simple analysis, you can try identify where it comes from. From the mail header, it will tell you which email server does it come from. In some cases, some email server will have the IP address of the user who sent the email as well. Go havva look, the picture below show you how to get the mail header in Gmail. For other main clients, you can refer to this site.
http://www.mycert.org.my/en/resources/email/email_header/main/detail/509/index.html