Is the e-mail address being spoofed?

Hi, I hope someone can help me. My mother, who has a Hotmail account, recently began receiving masses (15+ per day) of emails from postmaster@mail.hotmail.com entitled "Delivery Status Notification (Failure)‏". The attached messages are in French and English and certainly were not composed by my mother, and have links for dodgy looking companies. The failed recipients are things like "dxcqzk@vpydld.com" which are obviously nonsense. How can I stop this from happening? She has now changed her password, but are there any other steps we can take to stop these e-mails from arriving? Thanks in advance for any help.

It sounds as if yes indeed her email address is being spoofed. There really isn't anything she can do but wait it out. Spammers usually don't stick with using one address for very long. Changing the password is no help in this situation. The bottom line is you cannot stop it from happening.
Spoofing an email address is the electronic equivalent of you sending a letter throught the post office and putting your next door neighbors address as the return address.

There is a small possibility that she has an infected system. Scan with your antivirus and malware programs.

Will do, just realised AVG hasn't actually completed a scan for two weeks. Thanks for the reply.