Q: I received Gmail notifications from the "mailer-daemon" that an e-mail message I sent couldn't be delivered. But I never sent that message. So far, I've changed my Gmail password and switched to using my Yahoo Mail account instead. But the "mailer-daemon" notifications are now showing up in my Yahoo e-mail (the "alternate e-mail address" for my Gmail account.) What should I do? Block the sender?
Michael Kehoe, Minneapolis
A: The real "mailer-daemon" software notifies you when a legitimate e-mail you sent can't be delivered. But when the notification is for an e-mail you didn't send, you are getting spam.
You could have gotten it for a couple of reasons. Someone online may have taken over your Gmail account and used it to send spam. When the spam couldn't be delivered, it bounced back to you. Alternatively, a spammer may be trying to provoke you into responding, "But I never sent that e-mail!" If you respond to or block the sender, you're telling the spammer that a) your e-mail address works and b) you may be inclined to respond to other bogus e-mail in the future.
Do two things. Download the free version of the Malwarebytes (see tinyurl.com/y5c375y8) security program, which will eliminate any PC malware that might be generating the warnings. Then delete the mailer-daemon messages or send them to your Gmail and Yahoo spam filters. The latter will help Gmail and Yahoo filter out this type of spam before it reaches you.
Q: How can I turn off automatic webpage refreshes in Windows 10? I often lose the spot where I was reading when a new version of the webpage appears.
Dave Houg, Eagan
A: It isn't a Windows 10 issue; it's a web-browser problem.