--> A PTR record or pointer record, enables someone to perform a reverse DNS lookup.
--> This allows determining the domain name based on the IP address.
--> There is no requirement that you need to have a valid PTR record to send emails from your email gateway to the outside world.
--> PTR record verification checks are most commonly used by E-mail Gateway to find the suspiciousness of an email.
--> Because spammers are more likely to use fake domain names and dial-up IP addresses to send an email to the organization and mostly do not have PTR record configured.
--> Usually when E-mail Gateway receives the email from the outside with the source IP address 1.1.1.1 then it's gonna perform a reverse lookup to find the domain name associated with it.
--> If an E-mail Gateway determines that your PTR record is invalid, it is more likely to classify your email as junk mail or might block your email.
--> Blocked emails can result in lost business, damaged relationships with clients, and wasted time.
--> In Most of the cases, your email will be rejected if the company does not have a valid PTR record.
--> For example, Companies like AOL and Yahoo-Email reject email messages without valid PTRs.
--> In order for the email to be delivered/sent successfully to other organizations, Your Company PTR record should match with the MX hostname on port 25 when the receiving server returns a verification check.
--> You can ask the ISP to create the PTR record for your mail server, It is the responsibility of the ISP to create the PTR record for you.
--> It is not recommended to configure multiple hostnames under a single PTR record.
--> This allows determining the domain name based on the IP address.
--> There is no requirement that you need to have a valid PTR record to send emails from your email gateway to the outside world.
--> PTR record verification checks are most commonly used by E-mail Gateway to find the suspiciousness of an email.
--> Because spammers are more likely to use fake domain names and dial-up IP addresses to send an email to the organization and mostly do not have PTR record configured.
--> Usually when E-mail Gateway receives the email from the outside with the source IP address 1.1.1.1 then it's gonna perform a reverse lookup to find the domain name associated with it.
--> If an E-mail Gateway determines that your PTR record is invalid, it is more likely to classify your email as junk mail or might block your email.
--> Blocked emails can result in lost business, damaged relationships with clients, and wasted time.
--> In Most of the cases, your email will be rejected if the company does not have a valid PTR record.
--> For example, Companies like AOL and Yahoo-Email reject email messages without valid PTRs.
--> In order for the email to be delivered/sent successfully to other organizations, Your Company PTR record should match with the MX hostname on port 25 when the receiving server returns a verification check.
--> You can ask the ISP to create the PTR record for your mail server, It is the responsibility of the ISP to create the PTR record for you.
--> It is not recommended to configure multiple hostnames under a single PTR record.
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