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** Name: <code>_dmarc.horatio.us</code>, Value: <code>v=DMARC1;p=quarantine;</code>
These DNS records are required to prevent spammers from spoofing your email. It's quite simple to spoof your email, simply set the "From" header to whatever you want, and so you could just use <code>From: steven@example.com</code> to a bunch of people. The <code>spf1</code> DNS record says that if an email sent outside of the IP <code>141.219.188.20</code>, then they'll assume someone else was trying to spoof your email. With no <code>spf1</code> record, there's no way to know if this email is spoofed or not, so your domain will not be trustworthy. If someone actually <em>does</em> try to use your email, it'll be quarantined following your <code>DMARC1</code> value. Finally, if someone spoofs your IP somehow, they will also require your private key to compare with your <code>DKIM1</code> public key shown in the third <code>TXT</code> record.
Finally, you'll need to set your <code>rDNS</code> record on your server yourself. I don't know how to do this on a server you own, but if you're using a VPS, you set this rDNS value on your server, not the domain. <code>rDNS</code> is a lookup parameter so someone requesting your IP (<code>dig -x 141.219.188.20</code>), it'll respond with the mail server domain name.
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