The only way anyone can intercept your email is if they know your password. As for junk email, spammers do not need to know your password to send you junk mail - all they need to know is your email address, which they can get from various email addresses lists.
To check if your email is being intercepted send yourself few messages and see if you are able to receive them (try sending them from a different email address).
The way to stop any possible interception is to change your password and not give it to anyone.
Hope this helps.
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As for the question on how can one get your password without you giving it to them, it could be either that they have secretly installed a keylogger program on your system through a downloaded file or email attachment whereby they can monitor your keystrokes, or they have used what is called brute force attack program which can automatically generate and try millions of password until it finds the right password.
First you need to check if there is a keylogger program installed on your system, and if found you must remove it. The link below takes you through the process of detection and removal:
http://www.pctools.com/spyware-doctor/keyloggers.php?ref=google_keyloggers
Once you have removed any keylogger spyware, make sure you are connected to a secure wireless connection, and login to your email account and change your password - make sure you use a strong password with the following characteristics:
This would take care of any future attempts to find your new password through brute force attacks.
When you have done that, the person who had your previous password will not be able to go to your account again to see the new password.
BS Degree in Engineering.
Math, science and 25 years experience in computer programming and troubleshooting.