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Securing unused domains

A lot of companies have reserved more than one domain name for their organization. Multiple of those domain name are not been used for email purpose but are a target for hackers to use them for phishing attacks.

It’s highly recommended to have at least some basic DNS records to protect the domain name for phishing.

. TXT "v=spf1 -all"
. MX . 0
_dmarc. TXT "v=DMARC1; p=reject;"

The above SPF record specifies that there are no mail servers been authorized as sending mail server. The DMARC rule specifies what has to be done with non legitimate mail.

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