> On 11-16-2021 5:55 pm, Ruben Safir wrote: > I got an email from cpa...@mrbrklyn.com which is not from > us, as we are mrbrklyn.com > > How do I block email with this on the From line
You could just block any mail received on port 25 with mrbrklyn.com using a header check as someone else mentioned. However that doesn't really fix the issue. Have you setup DKIM, SPF and DMARC for your server? I can see your domain has an SPF record, but i don't see a DKIM signature in your email or a DMARC policy for your domain. Having all three working will allow your server to reject (or flag as spam) fake / forged emails sent from servers not authorized by the from domain. It would also prevent people from sending emails to others using your domain. And the side effect is your own server would reject email sent to it from someone else claiming to be you because it would know they are not authorized per your DMARC policy.
