Email from my domain is being sent which I do not create

Have recently started receiving "undeliverable" messages on emails which come from my domain but are not created by me. The email is from my domain but from a username which does not exist. The email is addressed to a username on my domain which also does not exist. This looks like a spammer is somehow sending messages from my domain. We are set up to prevent open relay. Any idea what I need to do to stop this or what it is?

Spammers can put whatever they want in the From header. There is nothing you can do about it, but that doesn’t mean they’re using your SMTP server or that your mail account is compromised in any way.

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