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I have a lot of mail in my queue that seems to originate from “MAILER-DAEMON” instead of an actual email address. Where is it coming from?

April 26, 2017actual coming email address mail MAILER-DAEMON originate Queue

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I have a lot of mail in my queue that seems to originate from “MAILER-DAEMON” instead of an actual email address. Where is it coming from?

1 Answer

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Those are bounce messages from your server that cannot be delivered to original senders of previously undeliverable mail. Most often this happens when your server is accepting messages for non-existent users. See a related question. If you are already rejecting messages for non-existent users, this might be caused by one of your own users infected with a virus. Check your logs to see where the original messages are coming from.