eMails on my domain are being spoofed
If you start seeing a bunch of emails bouncing back to you that you did not send, your domain is likely being spoofed. If you look at the emails to and from addresses and you don't them, spammers are spoofing your domain to send emails to people. Example:
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This report relates to a message you sent with the following header fields:
Message-id: <20170321154052.37DA5E0A878CB4@yourdomain.com <mailto:20170321154052.37DA5E0A878CB4@yourdomain.com>>
Date: Tue, 21 Mar 2017 15:40:52 +0800
From: Julia Mcclain <Mcclain0903@yourdomain.com <mailto:Mcclain0903@yourdomain.com>>
To: Nevil@otherdomain.com <mailto:Nevil@otherdomain.com>
Subject: Find out now why this company is going up tenfold by this time next
Your message cannot be delivered to the following recipients:
Recipient address: Nevil@pepsidrc.ae <mailto:Nevil@otherdomain.com>
Reason: Illegal host/domain name found
Remote system: dns;drcntx1.otherdomain.com (Too many invalid recipients)
Reporting-MTA: dns;aimail3.otherdomain.com (tcp_ae-daemon)
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The from name and email is from your domain name but does not exist. If that's the case, this is a spoofed message. Likely you have a catchall on your domain and these are routinely targeted and abused by spammers. Spammers find a domain that lets firstname.lastname@example.org work and use that to send spam because if a remote server verifies that the from address exists, it'll always succeed and get delivered. We recommend that you delete the catchall account. Once you delete the catchall, the remote servers will verify whether or not a from account exists and obviously bad ones will fail that check and message will not get delivered.
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