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https://support.earthlink.net/articles/email/how-to-check-reverse-dns-(ptr)-for-email.php
Email and Reverse DNS (PTR) Checking When sending email from a mail server, it is important for anti-spamming purposes that the sending server has a proper Reverse DNS record. This shows that the person sending email as a specific domain name has the permission of …
https://serverfault.com/questions/347662/reverse-dns-and-mail-delivery-550-4-4-7
The 'reverse DNS' check is usually done against the hostname provided by your MTA with the smtp HELO command. So, configuring your MTA so that it uses vpsname.myISP.com to present itself should be enough. If you use Postfix the smtp_helo_name directive should do it.
https://www.debouncer.com/reverse-dns-check
Reverse DNS lookup is the inverse process of this, the resolution of an IP address to its designated domain name. While receiving an email message, a mail server may try to attempt reverse IP lookup. If PTR record lookup fails (no PTR record) or PTR record is not forward confirmed or looks like generic, the message may be marked as spam or rejected.
http://social.dnsmadeeasy.com/blog/dnscoach/reverse-dns-email-marketing/
Mar 27, 2017 · Reverse DNS: The Secret Behind Email Marketing Deliverability. There are many security measures that your domain needs to pass in order for your emails to reach your clients’ inboxes. Reverse DNS is the biggest deliverability killer, as almost all mail servers use this method to verify incoming domains.
https://www.itworld.com/article/2833006/how-to-setup-reverse-dns-and-ptr-records.html
The most common reason for establishing a reverse DNS is for outbound e-mail servers. Since a reverse DNS record adds further tracing to the origin of an e-mail, it also adds credibility to the...
https://www.rackaid.com/blog/email-dns-records/
Mar 28, 2017 · If you have to get one DNS record right, the reverse DNS record, also know as a PTR record, is the one. As the name states, these records do the reverse of what a normal DNS A record does — they map IP addresses back into host names. Without a valid reverse DNS record, many ISPs will block your email.
https://www.mxpolice.com/email-security/importance-of-ptr-records-for-reliable-mail-delivery/
Sep 25, 2011 · A PTR record, or pointer record, enables someone to perform a reverse DNS lookup. This allows them to determine your domain name based on your IP address. Because generic domain names without a PTR are often associated with spammers, incoming mail servers identify email from hosts without PTR records as spam.
https://mxtoolbox.com/problem/smtp/smtp-reverse-dns-resolution
When a sending server makes a connection to the recipient server, the recipient server notes the sending IP address and performs a reverse lookup, called a PTR lookup, named after the type of DNS record used. If the result of the reverse lookup matches the result of a forward DNS Lookup, then it's much more likely that the message is legitimate.
https://mxtoolbox.com/ReverseLookup.aspx
ABOUT REVERSE LOOKUP. The Reverse Lookup tool will do a reverse IP lookup. If you type in an IP address, we will attempt to locate a dns PTR record for that IP address. You can then click on the results to find out more about that IP Address. Please note that in general, your ISP must setup and maintain these Reverse DNS records (i.e. PTR records) for you.
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