This is a case where you receive an email from someone insisting that you sent them an infected message. On just about every occasion, the message actually does look like it was sent from you and more than likely included an attachment which is infected. These are fake emails sent from someone with the intent to do various harm and somehow obtained your Gmail address to do so.
The trick to it is that they sometimes get sent back to you as undeliverable. So you end up with an error email about it. For the most part, you can report other Gmail users if you know who is doing this to you. But unfortunately, you can't always find out who is doing what online. The other help to this is with the use of Block Sender. This extension for Gmail users using Google Chrome can block the undeliverable message from getting into your inbox when the person responsible ends up sending it to an actual invalid address.
To block the error message, follow these steps:
- Install Block Sender for Gmail by clicking the "Install" button found in the upper right-hand corner of this site. The installation won't take long. Open Gmail when it is done.
- After signing up for a Block Sender account and linking your Gmail account to Block Sender, open an email from your account that you don't want to receive anymore, and click the "Block" button on the messages toolbar.
- Select the "Emails with same subject" option. Or if you're sure that the email address sending you these emails isn't actually yours (but looks similar), then you can select "Emails from this sender"