I am receiving mail from my domain that I did not send

These messages are most likely coming from an infected computer/server that you have had contact with. These messages are not coming from your server and your domain name is only being forged in the ‘from’ field of these messages. Unfortunately, there is not alot that can be done to stop this. About the only thing you can do is change your mail catch-all to ‘bounce’ which will stop the mail being addressed to bogus (undefined) addresses at your domain.

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