Hi, I have a client who would like to implement DMARC to offset spoofing. Spammers are sending from one of their subdomains, let’s call it spam.client.com.
My understanding is they would need to apply SPF and DKIM to that subdomain before setting up DMARC. They already have SPF and DKIM in place from their actual sending domain, send.client.com. My question is if they go through the trouble to set up DKIM/SPF/DMARC on the spam.client.com domain what is to stop the spammer from just changing to another domain like spammers.client.com? If I apply the DMARC to their parent domain (client.com), would that cover all subdomains? Thank you for your help! [Description: 2012-signature-logo] Kevin Rehberg | Account Development Coordinator [email protected]<mailto:[email protected]>| www.bluehornet.com<http://www.bluehornet.com/> Office: 619-342-4362 | Fax: 619-295-1246 2355 Northside Drive Suite B250 | San Diego, CA 92108
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