Reverse DNS For Subdomain

Posted October 24, 2013 5.1k views
We run our main site off a subdomain and are getting emails (sent with sendmail) bounced with error: 554 IP name lookup failed. No PTR record found. It looks like the fix is to rename the droplet to the correct hostname. My question is whether my hostname should be or, remember that people access One of those links says

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Rename your droplet to and create an A record for