Spoofed Email Address - XFinity

For Spoofed Email Address, relating to XFinity-Comcast internet question. I believe a spammer is spoofing my email address. I have recieved a large number of email notifications from mailer-daemon@comcast.net showing permanent error and saying, "Delivery to the following recipients failed permanently". Now all these returned emails were sent to people I do not know and seem random. None are in my contacts nor appear in my sent folder. To be safe, I ran a malware scan which was clean and also changed my email password. Each returned email contains 3 file attachments---.dat, .txt, .eml formats. So as near as I can figure a spammer is spoofing my address as a return address. Please advise....

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