First of all, there is nothing you can do to stop others send emails with "From: you@your_domain.com" among the headers.

One would be very stupid if he would block emails coming from a given domain because he got spam mails from this domain. The only thing to look at is the IP address from where the email is coming. Even so, these emails are probably sent from countries where they don't care about these things.

If your "catch-all" option of your email server is enabled, disable it. This will significantly reduce the number of spam emails you receive.

Jean-Luc

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