I have been getting lots of mails to a couple of my domains saying that the emails sent from the domains could not be delivered or was filtered due to spam or virus. Many of them has attachments containing viruses. An example is domain.com is my domain Many such mails have come from different IP's. The addresses on my domain seem to be randomly generated. Is this due to some security flaw? Is there a way to stop this? Is there a risk for my domains getting blacklisted for spam or viruses for this? Please help.
Sounds like a someone is sending spam emails with your email address as the return address. It happens from time to time and there is not really anything you can do. The "undeliverable" emails should die off after a couple of days.
It does look like someone is sending spam emails with my domain email address as the return address But it does not seem like lying down - it has been there for a month!
Winning.Email will be able to analyze your domain and see if there's things you can do to improve your email delivery. Should help reduce those delivery failures.