When multiple PTR records are defined for one IP address, an email service can pick up a random one during a Reverse DNS lookup. And it may not always match the A record. Unlike MX records, you can’t specify the priority for PTR records.What is mxtoolbox?
MxToolbox is YOUR expert on email deliverability. MxDelivery Center analyzes your DMARC, DKIM and SPF to give you the insight you need to make email configuration changes and get your emails to your customer's.What is a PTR record and how to configure it?
So, the PTR record ensures that your IP address officially connects to your host. Configuring the PTR record is essential if you’re using both internal or external mail servers. This record adds reliability to sending servers and allows the receiving end to check the hostname of your IP address.How do I test for MX records for a domain?
This test will list MX records for a domain in priority order. The MX lookup is done directly against the domain's authoritative name server, so changes to MX Records should show up instantly. You can click Diagnostics , which will connect to the mail server, verify reverse DNS records, perform a simple Open Relay check...