A PTR is a reverse lookup record in the DNS server that returns a hostname for a given IP address. It is the opposite of an A record, which resolves a hostname to an IP.
Consider the following example:
nslookup -q=ptr 22.214.171.124This should return
A PTR record is vital for a successful email delivery. Without this entry, your emails will be treated as junk.
A PTR record goes into the ISP's DNS server, which owns the IP address. For example, if you get an IP address from Verizon FIOS, this record goes into Verizon's DNS server, not yours. Therefore, you must ask your ISP to associate a name to this IP. ISP typically will only add a PTR record if you have a static IP address. They will not do it for a dynamic IP.
Use the following steps if you're using Xeams:
Use the following steps if you're not using Xeams: