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Why did MAILER DAEMON return my e-mail from an e-mail address I never sent to?

I have a dedicated linux server of which I sent an e-mail from (account A) to another email address account (account B) of mine on a different shared host and I did successfully receive the email in account B. However, from account B, I also received a MAILER-DAEMON email from my server stating: I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out. <abc@abc.com>: Sorry, no mailbox here by that name. vpopmail (#5.1.1) I don't know who abc@abc.com (email changed for privacy) is and I never even e-mailed this person. Does this mean my server is hacked or has a spam bot overriding my mail server or something? Sorry I meant to state that I had received the MAILER-DAEMON email in my Account A, with the same returned message on the bottom as the email I had sent to Account B!

Public Comments

1. your email address is being spoofed to send spam. Since the spam sent it to a bad address it got bounced back to you
2. Not sure since you think it's your own server that sent it but be wary of emails that claim to be from mailer-daemon and you don't think it's in response to an email you sent because there are spam emails like this doing the rounds now - I've had one or more. I suppose it's possible for the server name to be appended to the email - a spam email can certainly harvest your name to put on an email. EDIT: Just seen your edit - that IS weird. Would your ISP help you with it or don't you have one? (Is that even possible not to have an ISP anymore??) Or whoever the DNS hosting is through? @RemotePC - they have a Linux server so a virus is fairly unlikely. And Avira has a free antivirus and they have scored very highly in some comparative tests recently - poke around here for the results; I'm not sure exactly where they are: http://www.av-comparatives.org/